Origin of the Open Circuit Potential in Perovskite Solar Cells with a Mesoporous TiO2 Scaffold

Arie Zaban^a, Ronen Gottesman^a, Laxman Gouda^a, Pablo P. Boix^b

^aDepartment of Chemistry, Center for Nanotechnology & Advanced Materials, Bar-Ilan University

^bEnergy Research Institute @ NTU, Level 5, Research Techno Plaza, 50 Nanyang Drive, Singapore, 637553, Singapore

NIPHO
Proceedings of Perovskite Thin Film Photovoltaics (ABXPV16)

Barcelona, Spain, 2016 March 3rd - 4th

Organizers: Emilio Palomares and Nam-Gyu Park

Oral, Arie Zaban, presentation 066
Publication date: 14th December 2015

The high open-circuit potential (Voc) achieved by perovskite solar cells (PSCs) is one of the keys to their success.The Voc analysis is essential to understand the PSCs' working mechanisms. A large number of CH₃NH₃PbI₃^-xClxPSCs were fabricated on single large-area substrates and their performance and Voc dependence on illumination intensity I0,were measured. From studying the Voc at different I0 (5.10^-5 sun < I0 < 1 sun), three distinctive regions were recognized. We propose that two working mechanisms, which are located in separated regions, control PSCs' Voc. The rise of Voc at low I0is determined by the employed semiconductor n-type contact (TiO₂ or MgO coated TiO₂). In contrast, at I0close to AM1.5G, the employed oxide does not affect the achieved voltage. Thus, a change of regime from an oxide-scaffold-dominated EFn (as in the dye sensitized solar cells) to an EFn, directly determined by the CH₃NH₃PbI₃^-xClx absorber is suggested. The mechanism and its implication on cell operation will be discussed.

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