Working mechanisms of lead-free and lower dimensionality perovskite solar cells

Pablo P. Boix^a, Nripan Mathews^a, Subodh Mhaisalkar^a

^aEnergy Research Institute @ NTU (ERI@N), Research Technoplaza, Nanyang Technological University, Singapore, Nanyang Drive, Singapore, Singapore

^bMSE, Nanyang Technological University, Nanyang Avenue, Singapore 639798

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, Nripan Mathews, 174
Publication date: 5th February 2015

The rise of CH₃NH₃PbI₃ solar cells has been a revolution for the photovoltaic community. In addition to the high power conversion efficiencies, the basic physical processes involved in the power generation have attracted much attention, producing surprising optical and electrical results. However, the need to develop less toxic perovskites counterparts has changed the whole picture. The basic mechanisms determining the solar cell performance, not fully understood for CH₃NH₃PbI₃ based devices yet, have to be reconsidered, and the limiting factors have to be identified in order to improve the efficiency of these new alternatives. Essential processes, such as charge recombination and charge transport, are suffering important problems which will have to be solved. Here, we present a comprehensive analysis of solar cells based on alternative perovskites, such as lower dimensionality and Sn-based materials^1,2, exposing some of the differences compared with the standard CH₃NH₃PbI₃ solar cells and highlighting some of the complications which have to be improved.
Figure Crystal structure of MA2CuCl2Br2, showing the alternation of organic and inorganic layers and absorption measured for MA2CuCl2Br2. Inset: schematic representation of the electronic transitions 1 and 2 (〖Cu_d〗_(x^2-y^2 )→Cl_p_x-p_y) and d-d transitions 3 (〖Cu_d〗_xy→〖Cu_d〗_(x^2-y^2 )).
1. M. H. Kumar, S. Dharani, W. L. Leong, P. P. Boix, R. R. Prabhakar, T. Baikie, C. Shi, H. Ding, R. Ramesh, M. Asta, M. Graetzel, S. G. Mhaisalkar, and N. Mathews, Adv. Mater., 2014, 26, 7122–7127. 2. D. Sabba, H. K. Mulmudi, R. R. Prabhakar, T. Krishnamoorthy, T. Baikie, P. P. Boix, S. Mhaisalkar, and N. Mathews, J. Phys. Chem. C, DOI: 10.1021/jp5126624, 2015.

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