Suppression of the Pb2+ defects in the perovskite films using Lewis- base additives in perovskite solar cells.
M. Abdel-Shakour a b, Towhid H. Chowdhury a, Kiyoto Matsuishi c, Ashraful Islam a c
a Photovoltaic Materials Group, Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba 305-0047, Japan.
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, Tsukuba, Ibaraki 305-8573, Japan
nanoGe Perovskite Conferences
Proceedings of International online conference on Hybrid materials and optoelectronic devices (HYBRIDOE)
Online, Spain, 2020 December 15th - 17th
Organizers: Xueqing Xu, Baomin Xu, Hin-Lap (Angus) Yip and Xinhua Zhong
Poster, M. Abdel-Shakour, 051
Publication date: 4th December 2020

Perovskite solar cells (PSCs) have seen a rapid rise in power conversion efficiency (PCE) over the period of just a decade. However, perovskite compounds suffer from structural defects such as - undercoordinated ions at the surface, which limits the overall photovoltaic performances. Herein, we utilized two β-diketone Lewis base additives within the antisolvent to chemically passivate the undercoordinated Pb2+ defects in the perovskite films via a one-step spin-coating process. The two β-diketone passivators could successfully interact with Pb2+ defects by forming a coordination bond using the two carbonyl groups. We confirmed the interaction between the additives and the perovskite film by measuring the FTIR for the modified perovskite films, which showed a clear peak for C═O group. Compared to the pristine MAPbI3 films, the passivated perovskite films fabricated with β-diketone Lewis base additives show enhanced photoluminescence intensity and improved perovskite film quality, which are credited to the suppression of the defect. The incorporation of the two β-diketone passivators could successfully enhanced the PCE by 45% for the β-diketone passivated devices compared to the pristine device.

 A.I. acknowledges the support from JSPS KAKENHI grant no. 18H02079. M. A-S thanks the Egyptian Ministry of Higher Education & Scientific Research for the financial support through the Egypt-Japan Education Partnership (EJEP)-3rd call.

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