Ultrathin film, high specific power InP solar cells on flexible plastic substrates

Kuen-Ting Shiu; Zimmerman, Jeramy; Hongyu Wang; Forrest, Stephen R.
November 2009
Applied Physics Letters;11/30/2009, Vol. 95 Issue 22, p223503
Academic Journal
We demonstrate ultrathin-film, single-crystal InP Schottky-type solar cells mounted on flexible plastic substrates. The lightly p-doped InP cell is grown epitaxially on an InP substrate via gas source molecular beam epitaxy. The InP substrate is removed via selective chemical wet-etching after the epitaxial layers are cold-welded to a 25 μm thick Kapton® sheet, followed by the deposition of an indium tin oxide top contact that forms the Schottky barrier with InP. The power conversion efficiency under 1 sun is 10.2±1.0%, and its specific power is 2.0±0.2 kW/kg. The ultrathin-film solar cells can tolerate both tensile and compressive stress by bending over a <1 cm radius without damage.


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