Photoexcited Carrier Dynamics, Interface Passivation and Mechanism for Improving Photovoltaic Performance in Perovskite Solar Cells
Qing Shen a e, Taro Toyoda a e, Yuhei Ogomi b e, Shuzi Hayase b e, Kenji Toshino c e, Takashi Minemoto d e
a The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo, 182, Japan
b Kyushu Institute of Technology, 204 Hibikino Wakamatsu-ku, Kitakyushu - Fukuoka, 808, Japan
c Miyazaki University, 1-1 Gakuen, Kibanadai-nishi, Miyazaki 889-2192, Japan
d Ritsumeikan University
e CREST, Japan Science and Technology Agency (JST), Saitama 332-0012, Saitama 332-0012, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Invited Speaker Session, Qing Shen, presentation 129
Publication date: 7th November 2016

The interest in organometal trihalide Pb perovskite (CH3NH3PbI3)-based solar cells has increased more and more in recent years because of the high efficiencies achieved, with a record of over 22% [1], and the simple low temperature preparation method. The high efficiency was thought to mainly originate from the strong optical absorption over a broader range (up to 800 nm for Pb ), low Urbach energy due to low defect states, and longer lifetimes of photoexcited charge carriers of the organometal trihalide Pb perovskite absorbers. Further improvements in the photovoltaic performance can be obtained by increasing the light harvesting in the NIR region up to 1000 nm by using Sn/Pb cocktail halide based perovskite materials [2]. On the other hand, a good understanding of the key factors governing the photovoltaic performance of the Pb and Sn/Pb perovskite solar cells, especially photoexcited carrier dynamics, is very vital for uncovering the mechanism of achieving high efficiency. In this presentation, we would like to focus on the photoexcited carrier dynamics of Pb and Sn/Pb perovskite solar cells, including photoexcited carrier lifetime, charge separation and recombination dynamics at the interfaces of electron transport material/perovskite and hole transport material/perovskite, and the relationships between these dynamics and the photovoltaic properties. The mechanism for improving the energy conversion efficiency of the perovskite solar cells by means of interface engineering will be discussed [3-7].

References: [1] http://www.nrel.gov/ncpv/.  

[2] Y. Ogomi, A. Morita, S. Tsukamoto, T. Saitho, N. Fujikawa, Q. Shen, T. Toyoda, K.Yoshino, S. Pandey, T. Ma, and S. Hayase, J. Phys. Chem. Lett. (2014), Vol. 5, 1004.

[3] Y. Ogomi, A. Morita, S. Tsukamoto, T. Saitho, Q. Shen, T. Toyoda, K. Yoshino, S.S. Pandey, T. Ma, and S. Hayase, J. Phys. Chem. C (2014) Vol. 118, 16651.

[4] Q. Shen, Y. Ogomi,  J. Chang,  S. Tsukamoto,  K. Kukihara, T. Oshima, N. Osada, K. Yoshino, K. Katayama, T. Toyoda and S. Hayase, Phys. Chem. Chem. Phys.(2014), Vol. 16, 19984.

[5] Q. Shen, Y. Ogomi, J. Chang, T. Toyoda, K. Fujiwara, K. Yoshino, K. Sato, K. Yamazaki, M. Akimoto, Y. Kuga, K. Katayama, and S. Hayase, J. Mater. Chem. A (2015), Vol. 3, 9308.

[6] Q. Shen, Y. Ogomi, T. Toyoda, K. Yoshino, S. Hayase, Perovskite Materials - Synthesis, Characterisation, Properties, and Applications, Chapter 13, Likun Pan (Ed.), (INTECH, Feb. 2016).

[7] M. Moriya, D. Hirotani, T. Ohta, Y. Ogomi, Q. Shen, T. S. Ripolles, K. Yoshino, T. Toyoda, T. Minemoto, and S. Hayase, ChemSusChem (2016), Vol. 9, 2634.



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