IV hysteresis of solution-processed hybrid metal halide perovskite solar cells

Hong Lin^a, Henry Snaith^a^,^b, Tomas Leijtens^b, Mingzhen Liu^b, Giles Eperon^b, Ye Zhang^b^,^a

^aTsinghua University, Yifu Building Room 2422, Tsinghua University,Haidian District, Beijing, 100084, China

^bDepartment of Physics, Clarendon Laboratory, University of Oxford

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

Oral, Ye Zhang, presentation 108
Publication date: 5th February 2015

High-efficiency perovskite photovoltaic cells typically employ an organic-inorganic metal halide perovskitematerial as light absorber and charge transporter, sandwiched between a p-type electron-blocking organic hole-transporting layer and an n-type hole-blocking titania compact layer.¹Herein, we demonstrate that it is possible to fabricateplanar and mesoporous perovskite solar cells devoid of either charge transporting layer, which momentarily exhibit power conversion efficiencies (PCEs) of over 13%. This performance is not sustained however and is related to the previously observed hysteresis in perovskite solar cells. In contrast, devices including the titania compact layer exhibit stabilised efficiency much closer to that obtained by rapid current-voltage scanning. We propose that polarisation of the perovskite diode under forward bias results in an effective n-type doping of the perovskite near the anode and p-type doping of the perovskite near the cathode. This could provide the required built-in potential and selective charge extraction at each contact to enable efficient operation of the perovskite solar cells even in the absence of specifically choses charge selective n and p-type contact layers. The “contact doping” is consistent with long range migration and accumulation of ionic species within the perovskite at the metallic contacts. When the external field is reduced under working conditions, the ions can migrate away from the junctions, reducing the interface doping and the effectiveness of the operation of the solar cells. ²
1. M. M. Lee, J. Teuscher, T. Miyasaka, T. N. Murakami and H. J. Snaith, Science, 2012, 338, 643-647. 2. T. Leijtens, S. D. Stranks, G. E. Eperon, R. Lindblad, E. M. J. Johansson, I. J. McPherson, H. Rensmo, J. M. Ball, M. M. Lee and H. J. Snaith, ACS Nano, 2014, 8, 7147-7155.
1.M. M. Lee, J. Teuscher, T. Miyasaka, T. N. Murakami and H. J. Snaith, Science, 2012, 338, 643-647.

2. T. Leijtens, S. D. Stranks, G. E. Eperon, R. Lindblad, E. M. J. Johansson, I. J. McPherson, H. Rensmo, J. M. Ball, M. M. Lee and H. J. Snaith, ACS Nano, 2014, 8, 7147-7155.

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