Patent ID: 11914295
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Optics (Instruments)
Classification: CPC G  C | IPC C  G

Claim 12:
13. A composition for forming a silicon-containing resist underlayer film for EUV lithography, comprising:
the thermosetting silicon-containing material; and
a crosslinking catalyst, wherein
the thermosetting silicon-containing material comprises
(i) one or more of
a repeating unit shown by the following general formula (Sx-1),
a repeating unit shown by the following general formula (Sx-2), and
a partial structure shown by the following general formula (Sx-3),, wherein R1 represents an iodine-containing organic group; and R2 and R3 are each independently identical to R1, a hydrogen atom, or a monovalent organic group having 1 to 30 carbon atoms; and
the thermosetting silicon-containing material has an organic group represented by the following formula:

(P-Q1-(S1)v1-Q2-)u-(T)v2-Q3-(S2)v3-Q4  (Sm-R), wherein P represents a hydrogen atom, a cyclic ether group, a hydroxyl group, an alkoxy group having 1 to 4 carbon atoms, an alkylcarbonyloxy group having 1 to 6 carbon atoms, or an alkylcarbonyl group having 1 to 6 carbon atoms; Q1, Q2, Q3, and Q4 each independently represent -CqH(2q-p)Pp-, where P is as defined above, “p” represents an integer of 0 to 3, and “q” represents an integer of 0 to 10, provided that q=0 means a single bond; “u” represents an integer of 0 to 3; Si and S2 each independently represent —O—, —CO—, —OCO—, —COO—, or —OCOO—. v1, v2, and v3 each independently represent 0 or 1; T represents a divalent atom other than carbon, or a divalent group of an alicyclic, aromatic, or heterocyclic ring.