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High-efficiency perovskite solar cells based on the black polymorph of HC(NH2)2 PbI3.

Advanced materials (Deerfield Beach, Fla.) (2014-06-14)
Jin-Wook Lee, Dong-Jin Seol, An-Na Cho, Nam-Gyu Park
ABSTRACT

Perovskite solar cells with power conversion efficiencies exceeding 16% at AM 1.5 G one sun illumination are developed using the black polymorph of formamidnium lead iodide, HC(NH2)2 PbI3 . Compared with CH3 NH3 PbI3 , HC(NH2 )2 PbI3 extends its absoprtion to 840 nm and shows no phase transition between 296 and 423 K. Moreover, a solar cell based on HC(NH2 )2 PbI3 exhibits photostability and little I-V hysteresis.

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