Interface engineering in perovskite solar cells

Petra Cameron^a, Wentao Deng^a, Emily Draper^b, Dave Adams^b

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Wentao Deng, 447
Publication date: 5th February 2015

Organometal halide perovskite solar cells are currently of great interest due to their excellent light absorption ability and high charge mobility. Since being employed as the light absorber in Dye Sensitized Solar Cells(DSSCs), the efficiency of organometal halide perovskites based solar cell have increased to 20.1% in recent years.[1] However, despite all the effort to improve the cell performance, the majority of studies have looked at ways ofcontrolling the crystallization process of the perovskite layer, while very few studies have focused on surface engineering of the blocking layer. In this work, a group of perylenediimide derivatives (PDIs) with different functional groups have been used to modify the surface of the compact TiO2 layer in planar perovskite solar cells, and it is demonstrated that the hysteresis of the cells with PDIs was reduced when compared with cells without PDIs. In all these small molecules, a carboxyl group makes them anchor the TiO2 surface easily, and an electron donating group enables the modification of work function[2], which is beneficial to charge collection. Furthermore, the morphology of the perovskite layer can be controlled as the adsorbed layer changes the wetting properties of TiO2 layer.

[1] A. Kojima, K. Teshima, Y. Shirai, T. Miyasaka, Journal of the American Chemical Society 2009, 131, 6050;M. A. Green, K. Emery, Y. Hishikawa, W. Warta, E. D. Dunlop, Progress in photovoltaics: research and applications 2015, 23, 1. [2] J. Krüger, U. Bach, M. Grätzel, Advanced Materials 2000, 12, 447.

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