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Exhibit 10.31    
    

[GT
Solar International Letterhead] 

May 9,
2008

Fusen
E. Chen

13081 La Vista Court

Saratoga, CA 95070

Dear
Dr. Chen: 

        On
behalf of GT Solar International, Inc. ("GT Solar"), I wish to convey our appreciation for your decision to join the Board of Directors of GT Solar. We are very excited about
our growth opportunities, and are pleased that you have decided to help us reach our objectives. 

        According
to its bylaws, the business and affairs of GT Solar shall be managed by or under the direction of the Board of Directors. Our bylaws also state that Directors shall be elected
annually and shall hold office until the next annual meeting. 

        The
Board of Directors will meet on a regular basis, approximately four times each year, in addition to the Annual Meeting. Special meetings may be called periodically by the Chairman of
the Board or the President and CEO of GT Solar, Thomas Zarrella. 

        Your
compensation as a director will be $30,000 per year, payable quarterly in advance. In addition, you shall be eligible for additional fees in conjunction with your service on
committees of the Board of Directors. It is anticipated that you will serve on at least one Board Committee. A fee schedule outlining the fees for service on the Board and various committees is
attached as Exhibit A. All Board fees are subject to an aggregate cap of $75,000 annually per Board member. You shall also be eligible for reimbursement for reasonable and customary food,
travel and lodging expenses incurred by you in connection with your service as a member of the Board. 

        As
part of your Board membership, you will receive 1,000 restricted stock units, 500 of which will vest on the first anniversary of the grant and the remaining 500 of which will vest on
the second anniversary of the grant. However, the restricted stock units shall vest for only so long as you serve as a member of the Board. 

        Notwithstanding
the foregoing, in the event of the termination of your service as a result of a change in control of GT Solar, the restricted stock units shall vest according to the
following schedule: (i) if the termination occurs on or before the one year anniversary of your joining the Board, 500 of the restricted stock units shall vest, and (ii) if the
termination occurs during the 12 months immediately following the one year anniversary of your joining the Board, the remaining 500 restricted stock units shall vest. Finally, any grant to you
shall be subject to the terms of a Restricted Stock Unit Agreement which shall be furnished upon issuance of the grant. 

        To
confirm compliance with the requirements of Sarbanes-Oxley and NASDAQ listing rules, this offer letter is conditioned upon your providing to GT Solar a completed copy of the Directors
and Officers Questionnaire, a copy of which is enclosed, and GT Solar's acceptance of your responses to the questionnaire. 

        We
are truly excited about the prospect of your joining our Board. I am confident that your work will prove instrumental in helping us build a world-class company. Please confirm your
acceptance by 

 

executing
the enclosed copies of this letter and the enclosed Confidentiality Agreement, retaining one of each for your records, and returning one copy of each to GT Solar, attention Edwin Lewis, in
the envelope provided. As always, please feel free to contact me should you wish to discuss any aspect of your service on GT Solar's Board of Directors. 

	Sincerely,	 	 
	

/s/ J. Bradford Forth
	
 	

 
	

J. Bradford Forth

Chairman	
 	

 
	

cc: E. Lewis	
 	

 

	 	 	Accepted:
	

 	
 	

/s/ Fusen E. Chen
 Fusen E. Chen
	

 	
 	

Date:	

5/12/08

2

 
EXHIBIT A  

 GT Solar International, Inc.

Board Service Fee Schedule  

	Service Type
 
	 	Member Fee

(Annualized)
	 	Chairman Fee

(Annualized)

	Board Member Service 	 	$	30,000	 	 	Not Applicable
	

Audit Committee 	
 	
$	

7,500	
 	
$	

15,000
	

Supplemental pre-IPO Audit Committee 	
 	
$	

7,500	
 	
$	

15,000
	

Compensation Committee 	
 	
$	

5,000	
 	
$	

10,000
	

Supplemental pre-IPO Compensation Committee 	
 	
$	

5,000	
 	
$	

10,000
	

Governance & Nominating Committee 	
 	
$	

5,000	
 	
$	

10,000
	

Supplemental pre-IPO Governance & Nominating Committee 	
 	
$	

5,000	
 	
$	

10,000

Notes:  

	1.
	 The annual maximum annual total combined fee for GT Solar International, Inc. Board Service is $75,000.

 
	2.
	 Fees are disbursed proportionately on a quarterly basis gross, (less applicable taxes).

3

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Exhibit 10.32    
    

GUARANTY  

        This GUARANTY ("Guaranty"), dated as of April 1, 2006 is made by GT Solar Holdings, LLC, a Delaware
Limited Liability company, and GT Equipment Holdings, Inc., a Delaware corporation (each a "Guarantor" and collectively, the
"Guarantors") in favor of the persons listed on Schedule I attached to this Guaranty (together, the "Lender"), and their respective permitted
assigns and successors, with reference to the following facts: 

RECITALS  

        A.    Borrower
has entered into that certain Senior Secured Exchangeable Promissory Note dated as of the date hereof in favor of Lender in the original principal amount of
$15,000,000 (as amended or otherwise modified from time to time, the "Borrower Note"). 

        B.    As
a condition to the availability of the credit provided by Lender to Borrower evidenced by the Borrower Note, each Guarantor is required to enter into this Guaranty and
to guaranty the obligations of Borrower under the Borrower Note (the "Guarantied Obligations"). 

        C.    Each
Guarantor expects to realize direct and indirect benefits as the result of the availability of the aforementioned credit to Borrower. 

AGREEMENT  

        NOW, THEREFORE, in order to induce Lender to extend the aforementioned credit, and for other good and valuable consideration, the receipt and adequacy of which
are hereby acknowledged, each Guarantor hereby represents, warrants, covenants, agrees and guaranties as follows: 

        1.    Guaranty.    Each Guarantor hereby unconditionally and irrevocably guarantees the punctual payment when due,
whether at stated maturity, by acceleration or otherwise, of all of the Guarantied Obligations, whether for principal, interest (including, without limitation, all interest that accrues after the
commencement of any proceeding of Borrower under any debtor relief laws), fees, commissions, expense reimbursements, indemnifications or otherwise, and agrees to pay any and all reasonable costs, fees
and expenses (including reasonable counsel fees and out-of-pocket expenses) incurred by Lender in enforcing any rights under this Guaranty. This guaranty is a guaranty of
payment and not of collection. 

        2.    Guaranty Absolute.    Each Guarantor guarantees that the Guarantied Obligations will be paid strictly in
accordance with the terms of the Borrower Note, regardless of any law, regulation or order now or hereafter in effect in any jurisdiction affecting any such terms or the rights of Lender with respect
thereto. The obligations of each Guarantor hereunder are independent of the Guarantied Obligations, and a separate action or actions may be brought and prosecuted against Guarantor to enforce such
obligations, irrespective of whether any action is brought against Borrower or whether Borrower is joined in any such action or actions. The liability of each Guarantor hereunder shall be irrevocable,
absolute and unconditional irrespective of, and each Guarantor hereby irrevocably waives any defenses it may now or hereafter have in any way relating to, any or all of the following: 

        (a)   any
lack of validity or enforceability of the Borrower Note or any agreement or instrument relating thereto; 

        (b)   any
change in the time, manner or place of payment of, or in any other term of, all or any of the Guarantied Obligations, or any other amendment or waiver of or any
consent to departure from the Borrower Note, including, without limitation, any increase in the Guarantied Obligations resulting from the extension of additional credit to Borrower or otherwise; 

        (c)   any
taking, exchange or release of, or non-perfection of a lien on, any collateral securing the Guarantied Obligations, or any taking, release or amendment
or waiver of or consent to departure from any other guaranty, for all or any of the Guarantied Obligations; 

        (d)   any
change, restructuring or termination of the corporate structure or existence of Borrower; or 

        (e)   any
other circumstance (including, without limitation, any statute of limitations) or any existence of or reliance on any representation by Lender that might otherwise
constitute a defense available to, or a discharge of, Borrower or any other guarantor or surety. 

        This
Guaranty shall continue to be effective or be reinstated, as the case may be, if at any time any payment of any of the Guarantied Obligations is rescinded or must otherwise be
returned to Lender or any other person upon the insolvency, bankruptcy or reorganization of Borrower or otherwise, all as though such payment had not been made. 

        3.    Waiver.    Each Guarantor hereby waives promptness, diligence, notice of acceptance and any other notice with
respect to any of the Guarantied Obligations and this Guaranty and any requirement that Lender exhausts any right or takes any action against Borrower, any other person or any collateral securing the
Borrower Note. Each Guarantor acknowledges that it will receive direct and indirect benefits from the financing arrangements contemplated herein and that the waiver set forth in this Section 3
is knowingly made in contemplation of such benefits. Each Guarantor hereby waives any right to revoke this Guaranty, and acknowledges that this Guaranty is continuing in nature and applies to all
Guarantied Obligations, whether existing now or in the future. 

        4.    Continuing Guaranty; Assignments.    This Guaranty is a continuing guaranty and shall (a) remain in full
force and effect until the indefeasible payment in full in cash of the Guarantied Obligations and all other amounts payable under this Guaranty, (b) be binding upon Guarantor, its successors
and assigns and (c) inure to the benefit of, and be enforceable by, Lender and its successors, pledgees, transferees and assigns; provided that
Lender shall only be entitled to assign its rights under this Guaranty to the same extent as Lender is entitled to assign its rights under, and as set forth in, the Borrower Note. 

        5.    Maximum Liability.    The provisions of this Guaranty are severable, and in any action or proceeding involving
any state corporate law, or any debtor relief law, if the obligations of Guarantor under this Guaranty would otherwise be held or determined to be avoidable, invalid or unenforceable on account of the
amount of such Guarantor's liability under this Guaranty, then, notwithstanding any other provision of this Guaranty to the contrary, the amount of such liability 

shall,
without any further action by any Guarantor or the Lender, be automatically limited and reduced to the highest amount that is valid and enforceable as determined in such action or proceeding
(such highest amount determined hereunder such Guarantor's "Maximum Liability"). This Section with respect to the Maximum Liability of Guarantor is intended solely to preserve the rights of the Lender
to the maximum extent not subject to avoidance under applicable law, and no Guarantor nor any other person or entity shall have any right or claim under this Section with respect to such Maximum
Liability, except to the extent necessary so that the obligations of any Guarantor hereunder shall not be rendered voidable under applicable law. Each Guarantor agrees that the Guarantied Obligations
may at any time and from time to time exceed the Maximum Liability of any Guarantor without impairing this Guaranty or affecting the rights and remedies of the Lender hereunder, provided that, nothing
in this sentence shall be construed to increase Guarantor's obligations hereunder beyond its Maximum Liability. 

        6.    Subordination.    Each Guarantor hereby agrees that, after the occurrence and during the continuance of any
Default (as defined in the Borrower Note) or Event of Default (as defined in the Borrower Note), the payment of any amounts due with respect to the indebtedness owing by Borrower to each Guarantor or
by amounts due with respect to the indebtedness owing by Borrower to each Guarantor is hereby subordinated to the prior payment in full in cash of the Guarantied Obligations. each Guarantor hereby
agrees that, after the occurrence and during the continuance of any Default (as defined in the Borrower Note) or Event of Default (as defined in the Borrower Note), each Guarantor shall not demand,
sue for or otherwise attempt to collect any indebtedness of Borrower owing to each Guarantor until the Guarantied Obligations shall have been paid in full in cash. 

        7.    Subrogation.    Each Guarantor shall not exercise any rights that it may now have or hereafter acquire against
Borrower or any other guarantor of the Guarantied Obligations or that arise from the existence, payment, performance or enforcement of such Guarantor's obligations hereunder, including, without
limitation, any right of subrogation, reimbursement, exoneration, contribution or indemnification and any right to participate in any claim or remedy of Lender against Borrower or any other guarantor
of the Guarantied Obligations or any collateral securing the Borrower Note, whether or not such claim, remedy or right arises in equity or under contract, statute or common law, including, without
limitation, the right to take or receive from Borrower or any other guarantor of the Guarantied Obligations, directly or indirectly, in cash or other property or by set-off or in any other
manner, payment or security solely on account of such claim, remedy or right, unless and until all of the Guarantied Obligations and all other amounts payable hereunder shall have been indefeasibly
paid in full in cash. If (i) any Guarantor shall make payment to Lender of all or any part of the Guarantied Obligations, and (ii) all of the Guarantied Obligations and all other amounts
payable hereunder shall be paid in full in cash, Lender will, at Guarantor's request and expense, execute and deliver to such Guarantor appropriate documents, without recourse and without
representation or warranty, reasonably necessary to evidence the transfer by subrogation to such Guarantor of an interest in the Guarantied Obligations resulting from such payment by such Guarantor. 

        8.    Governing Law.    This Guaranty and all questions governing the construction, validity and interpretation of
this Guaranty will be governed by the internal law of the State of [New York]. 

        9.    Release.    This Guaranty shall be released when all Guarantied Obligations have been paid in full in cash or
otherwise performed in full. Upon such release of each Guarantor's obligations hereunder, Lender shall do all acts and things reasonably required to evidence or document the release of Lender's
interests arising under this Guaranty, all as reasonably requested by, and at the sole expense of, the Guarantors. 

*    *    *    *    *

        IN
WITNESS WHEREOF, each Guarantor has duly executed this Guaranty as of the date first written above. 

	 	 	GT SOLAR HOLDINGS, LLC
	

 	
 	

By:	
 	

OCM/GFI POWER OPPORTUNITIES FUND II, L.P.
	

 	
 	

By:	
 	

GFI Power Opportunities Fund II, GP, LLC
	

 	
 	

Its:	
 	

General Partner
	

 	
 	

By:	
 	

GFI Energy Ventures LLC, its Managing Member
	

 	
 	

By:	
 	

/s/ Richard Landers

	 	 	 	 	Name:	Richard Landers
	 	 	 	 	Title:	Principal
	

 	
 	

By:	
 	

OCM/GFI POWER OPPORTUNITIES FUND II (CAYMAN), L.P.
	

 	
 	

By:	
 	

GFI Power Opportunities Fund II GP (Cayman) Ltd.
	 	 	Its:	 	General Partner
	

 	
 	

By:	
 	

GFI Power Opportunities Fund II GP, LLC
	 	 	Its:	 	Director
	

 	
 	

By:	
 	

GFI Energy Ventures, LLC
	 	 	Its:	 	Managing Member
	

 	
 	

By:	
 	

/s/ Richard Landers

	 	 	 	 	Name:	Richard Landers
	 	 	 	 	Title:	Principal
	

 	
 	

GT EQUIPMENT HOLDINGS, INC.
	

 	
 	

By:	
 	

/s/ Howard Smith

	 	 	Name:	 	Howard Smith
	 	 	Title:	 	 	 

[Signature Page for Senior Secured Exchangeable Promissory Note Guaranty]

Schedule I  

	Name
	 	 

	OCM/GFI Power Opportunities Fund II, L.P.	 	 
	OCM/GFI Power Opportunities Fund II (Cayman), L.P.	 	 
	Angeleno Group	 	 
	Mount Hope GT Capital, LLC	 	 
	Royal Bank of Canada	 	 
	Dr. Kedar Gupta	 	 
	Jonathan A. Talbott	 	 
	Thomas M. Zarella	 	 

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Exhibit 10.32

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