Co-additive Engineering with Bifunctional Additive for Enhanced Performance and Improved Stability of Sn-based Perovskites Solar Cells
Md. Emrul Kayesh a b, Kiyoto Matsuishi c, Towhid H. Chowdhury a, Ryuji Kaneko a, Said Kazaoui d, Jae-Joon Lee e, Takeshi Noda a, Ashraful Islam a
a Photovoltaic Materials Group, Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS)
b Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
c Faculty of Pure and Applied Sciences, University of Tsukuba, Ibaraki 305-8573. Japan
d Research Center for Photovoltaics (RCPV), National Institute of Advanced Industrial Science and Technology (AIST)
e Department of Energy & Materials Engineering & Research Center for Photoenergy Harvesting and Conversion Technology, Dongguk University
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Kyōto-shi, Japan, 2019 January 27th - 29th
Organizers: Hideo Ohkita, Atsushi Wakamiya and Mohammad Nazeeruddin
Poster, Md. Emrul Kayesh, 047
Publication date: 23rd October 2018

For Sn-based perovskite solar cells (PSCs), the performance and long-term stability are the most challenging issues to be overcome to launch lead free PSCs in practical applications. In this case, the perovskite material itself has a facial tendency to oxidize from Sn2+ to Sn4+ and loses its favorable semiconducting properties for solar cells. Here, we present a coadditive engineering process with bifunctional organic additive to enhance the performance and stability of Sn-based PSCs. From the structural, morphological and elemental analysis, we revealed that the bifunctional groups of this additive anchor on the grain boundaries of perovskite through strong hydrogen bond formation with I- ion from SnI64- octahedron. The incorporation of this additive into the precursor solution also suppressed the Sn2+ oxidation and dark current density and enhanced the carrier lifetime. These positive aspects augmented the power conversion efficiency (PCE) from 3.3 % to 6.85%. More importantly, the operational stability was enhanced. The initial PCE of encapsulated PSCs remained unchanged up to 100 h at maximum power point tracing condition.

This work was party supported by JSPS KAKENHI grant No. 18H02079 (A.I). A.I. and J.L. acknowledges the support from NRF-2016M1A2A2940912. A.I. thanks H. Ohata at the Material Analysis Station of the National Institute for Materials Science for high-resolution XPS measurement.

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