Carbon-double-bond-free printed solar cells from TiO₂/CH₃NH₃PbI₃/CuSCN/Au: structural control and photoaging effects

Seigo Ito; Soichiro Tanaka; Henri Vahlman; Hitoshi Nishino; Kyohei Manabe; Peter Lund

doi:10.1002/cphc.201301047

Carbon-double-bond-free printed solar cells from TiO₂/CH₃NH₃PbI₃/CuSCN/Au: structural control and photoaging effects

Chemphyschem. 2014 Apr 14;15(6):1194-200. doi: 10.1002/cphc.201301047. Epub 2014 Mar 13.

Authors

Seigo Ito¹, Soichiro Tanaka, Henri Vahlman, Hitoshi Nishino, Kyohei Manabe, Peter Lund

Affiliation

¹ Department of Electric Engineering and Computer Science, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280 (Japan), Fax: (+81) 79-267-4858. itou@eng.u-hyogo.ac.jp.

PMID: 24634350
DOI: 10.1002/cphc.201301047

Abstract

Carbon double bond-free printed solar cells have been fabricated with the structure <F-doped SnO2 (FTO)/dense TiO2/nanocrystalline TiO2/CH3NH3PbI3/Au> and <FTO/dense TiO2/nanocrystalline TiO2/CH3NH3PbI3/CuSCN/Au>, in which CuSCN acts as a hole conductor. The thickness of the CH3NH3PbI3 layer is controlled by a hot air flow during spin coating. The best conversion efficiency (4.86%) is obtained with <FTO/dense TiO2/nanocrystalline TiO2/thin CH3NH3PbI3 (hot-air dried)/CuSCN/Au>. However, a thick CH3NH3PbI3 layer on CuSCN is better for light-exposure stability (100 mW cm(-2) AM 1.5) when not encapsulated. Without the CuSCN coverage, the black CH3NH3PbI3 crystal changes to yellow during the light-exposure stability test, which is due to the transformation of the CH3NH3PbI3 perovskite crystal into hexagonal PbI2.

Keywords: energy conversion; hole transport; perovskite phases; solar cells; structure control.