A solar sheet (30, 32, 34, 36, 40, 90, 190) configured for installation on a component of an unmanned aerial vehicle, comprising: a plurality of inverted metamorphic triple-junction solar cells (30aa-30df, 32aa-32bc, 34aa-34fc, 36aa-36df, 40aa-40dd, 48, 94, 194) each having a specific power in a range of 1500-4500 W/kg under air mass coefficient 1.5 (AM1.5) light or a specific power in a range of 1870-5680 W/kg under AM0 light, each inverted metamorphic triple-junction solar cell comprising: a top subcell including an AlInGaP layer or an InGaP layer; a middle subcell including a GaAs layer; a bottom subcell including an InGaAs layer; and a metal backing layer having a thickness in a range of 2 microns to 30 microns, wherein a first side of the metal backing layer is in direct contact with the bottom subcell; and a polymer layer (98, 198) having a thickness in a range of 15 microns to 30 microns that is attached to a top surface of the plurality of inverted metamorphic triple-junction solar cells; a first adhesive layer (92, 92', 92", 192) configured to attach the solar sheet to a component of an unmanned aerial vehicle, wherein the first adhesive layer has a thickness in a range of 8 microns to 25 microns, and wherein the first adhesive layer is in contact with a second side of the metal backing layer; and a second adhesive layer (96, 196) having a thickness in a range of 8 microns to 25 microns that attaches the plurality of inverted metamorphic triple-junction solar cells to the polymer layer. a plurality of inverted metamorphic triple-junction solar cells (30aa-30df, 32aa-32bc, 34aa-34fc, 36aa-36df, 40aa-40dd, 48, 94, 194) each having a specific power in a range of 1500-4500 W/kg under air mass coefficient 1.5 (AM1.5) light or a specific power in a range of 1870-5680 W/kg under AM0 light, each inverted metamorphic triple-junction solar cell comprising: a top subcell including an AlInGaP layer or an InGaP layer; a middle subcell including a GaAs layer; a bottom subcell including an InGaAs layer; and a metal backing layer having a thickness in a range of 2 microns to 30 microns, wherein a first side of the metal backing layer is in direct contact with the bottom subcell; and a top subcell including an AlInGaP layer or an InGaP layer; a middle subcell including a GaAs layer; a bottom subcell including an InGaAs layer; and a metal backing layer having a thickness in a range of 2 microns to 30 microns, wherein a first side of the metal backing layer is in direct contact with the bottom subcell; and a polymer layer (98, 198) having a thickness in a range of 15 microns to 30 microns that is attached to a top surface of the plurality of inverted metamorphic triple-junction solar cells; a first adhesive layer (92, 92', 92", 192) configured to attach the solar sheet to a component of an unmanned aerial vehicle, wherein the first adhesive layer has a thickness in a range of 8 microns to 25 microns, and wherein the first adhesive layer is in contact with a second side of the metal backing layer; and a second adhesive layer (96, 196) having a thickness in a range of 8 microns to 25 microns that attaches the plurality of inverted metamorphic triple-junction solar cells to the polymer layer.