Relationship between Relative Lattice Strain and Efficiency for Sn-Perovskite Solar Cells

Kohei Nishimura^a, Daisuke Hirotani^a, Gaurav Kapil^b, Chi Huey Ng^a, Kengo Hamada^a, Kamarudin, Muhammad Akmal^a, Ripolles Teresa^c, Shen Qing^d, Satoshi likubo^a, Takashi Minemoto^e, Kenji Yoshino^f, Hiroshi Segawa^b, Shuzi Hayase^a

^aKyushu Institute of Technology, Japan, 204 Hibikino Wakamatsu-ku, Kitakyushu - Fukuoka, 808, Japan

^bUniversity of Tokyo, Japan, Japan

^cUniversidad Rey Juan Carlos (URJC), C/Tulipán; s/n, Móstoles, 28933, Spain

^dUniversity of Electro-Communication

^eRitsumeikan University, 1-1-1 norohigashi Kusatsu, Japan

^fMiyazaki University, 1-1 Gakuen, Kibanadai-nishi, Miyazaki 889-2192, Japan

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)

Roma, Italy, 2020 May 12th - 14th

Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo

Invited Speaker Session, Shuzi Hayase, presentation 041
DOI: https://doi.org/10.29363/nanoge.hopv.2020.041
Publication date: 6th February 2020

Sn-perovskite solar cells are known as narrow band-gap solar cells which is expected to give higher efficiency than Pb perovskite solar cells from the view point of the narrow band gap energy, and is to be useful for the bottom layer for all-perovskite-tandem solar cells. We have already reported 20.4% efficiency for SnPb perovskite solar cells (1-3) and SnGe perovskite solar cells with 7.9% efficiency (4,5). There are some items which limit the enhancement of the efficiency. In this report, one of which, relationship between lattice strain and the efficiency is discussed. In the composition of QFAMASnI₃, Q was changed with Na⁺, K⁺, Cs⁺, Ethylammonium⁺(EA) and Butylammonium⁺ (BA) respectively, and the relationship between the lattice strain obtained from XRD and the photovoltaic performances were discussed. The efficiency of the solar cells with the Sn-perovskite solar cell had linear relationship with the relative lattice strain. Among them, EAFAMASnI₃ having least lattice strain gave the results of 7.6 %. The second item is trap distribution. The distribution of trap states within perovskite vicinity or hetero-interfaces is attributed to the low photovoltaic performances. Thermally stimulated current (TSC) was used for the evaluation of the trap states. The addition of 5 mole% germanium into the FAMASnI₃(FMSGI) suppressed the trap density from 10¹⁵-10¹⁷ cm^-3(without Ge) to 10⁸-10¹⁴ cm^-3 and gave longer charge diffusion length (~1 μm) to give 7.9% efficiency. In addition, on the SnPb perovskite solar cells, the relationship between the lattice strain and efficiency was discussed. By decreasing the lattice strain, the efficiency was enhanced to > 20%.

References:

[1] Kapil, G., Ripolles, T.S., Hamada, K., Ogomi, Y., Bessho, T., Kinoshita, T., Chantana, J., Yoshino, K., Shen, Q., Toyoda, T., Minemoto, T., Murakami, T.N., Segawa, H., Hayase, S., Highly Efficient 17.6% Tin-Lead Mixed Perovskite Solar Cells Realized through Spike Structure, Nano Letters, 18, p.3600-3607, 2018.

[2] Ogomi, Y., Morita, A., Tsukamoto, S., Saitho, T., Fujikawa, N., Shen, Q., Toyoda, T., Yoshino, K., Pandey, S.S., Ma, T., Hayase, S. CH3NH3SnxPb(1-x)I, perovskite solar cells covering up to 1060 nm, Journal of Physical Chemistry Letters, 5, p.1004-1011, 2014.

[3] Ripolles, Teresa; Yamasuso, Daiki; Zhang, Yaohong; Kamarudin, Muhammad Akmal; Ding, Chao; Hirotani, Daisuke; Shen, Qing; Hayase, Shuzi, "New Tin (II) Fluoride Derivative as Precursor for Enhancing the Efficiency of Inverted Planar Tin/Lead Perovskite Solar Cells", The Journal of Physical Chemistry, Part: Part C: DOI: 10.1021/acs.jpcc.8b09609, 2018.

[4] Ito, N., Kamarudin, M.A., Hirotani, D., Zhang, Y., Shen, Q., Ogomi, Y., Iikubo, S., Minemoto, T., Yoshino, K., Hayase, S. , Mixed Sn-Ge Perovskite for Enhanced Perovskite Solar Cell Performance in Air, Journal of Physical Chemistry Letters, 9, p.1682-1688, 2018.

[5] 11. Chi Huey Ng, Kohei Nishimura, Nozomi Ito, Kengo Hamada, Daisuke Hirotani, Fu Yang, Zhen Wang, Satoshi likubo, Qing Shen, Kenji Yoshino, Takashi Minemoto, Shuzi Hayase, Role of GeI2 and SnF2 Additives for SnGe Perovskite Solar Cells, Nano Energy, https://doi.org/10.1016/j.nanoen.2019.01.026, 2019.

nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.

MATSUS

Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.

International Conference on Hybrid and Organic Photovoltaics

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.