Advanced Materials (FRG) 2014-08-06

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

Jin-Wook Lee, Dong-Jin Seol, An-Na Cho, Nam-Gyu Park

Index: Adv. Mater. 26(29) , 4991-8, (2014)

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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.© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.