Interpretation of kinetic processes governing the operation of perovskite solar cells
Juan Bisquert a
Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
València, Spain, 2017 March 1st - 2nd
Organizers: Henk Bolink and David Cahen
Invited Speaker, Juan Bisquert, presentation 092
Publication date: 18th December 2016

The development of organic-inorganic lead halide perovskites with very large efficiency requires us to understand the operation of the solar cell. We have used the measurement of impedance spectroscopy in combination with current-voltage scans and physical modeling to obtain insights about the physical processes dominating the photovoltaic operation. This class of semiconductors presents remarkable bulk electronic and optical properties, but the contacts to the device are a key aspect of the operation and show important dynamic interactions. We provide an interpretation of capacitances as a function of frequency both in dark and under light, and we discuss the meaning of resistances and how they are primarily related to the operation of contacts in many cases. The capacitance reveals a very large charge accumulation at the electron contact, which has a great impact in the cell measurements, both in photovoltage decays, recombination, and hysteresis. We aim to present a global view of the formation of photovoltage and the kinetic processes governing the operation of the solar cell, providing a suitable unified explanation to the many strange observations reported in the last few years.

Ronen Gottesman, Pilar Lopez-Varo, Laxman Gouda, Juan A. Jimenez-Tejada, Jiangang Hu, Shay Tirosh, Arie Zaban, Juan Bisquert, Dynamic Phenomena at Perovskite/Electron-Selective Contact Interface as Interpreted from Photovoltage Decays, Chem , 1, 776-789 (2016)

Hui-Seon Kim, In-Hyuk Jang, Namyoung Ahn, Mansoo Choi, Antonio Guerrero, Juan Bisquert, Nam-Gyu Park, Control of I/V Hysteresis in CH3NH3PbI3 Perovskite Solar Cell, The Journal of Physical Chemistry Letters, 6, 4633-4639 (2015)

Isaac Zarazúa, Guifang Han, Pablo P. Boix, Subodh Mhaisalkar, Francisco Fabregat-Santiago, Ivan Mora-Sero, Juan Bisquert, and Germà Garcia-Belmonte, Surface Recombination and Collection Efficiency in Perovskite Solar Cells from Impedance Analysis, J. Phys. Chem. Lett., 10.1021/acs.jpclett.6b02193 (2016)

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