Issue 16, 2024

Constructing orderly crystal orientation with a bidirectional coordinator for high efficiency and stable perovskite solar cells

Abstract

A well-developed perovskite crystal at the beginning of a crystal lattice facilitates favourable growth orientation for efficient charge transport and the elimination of buried interfaces. However, rapid and uncontrollable crystallization of perovskites poses significant challenges in achieving desired growth orientations and controlling the growth direction during crystallization, necessitating the establishment of optimal substrate conditions. In this study, we propose a bidirectional coordination strategy involving the introduction of cesium trifluoroacetate (CsTFA) onto a tin dioxide (SnO2) surface. Treatment with CsTFA facilitates the passivation of SnO2 vacancies via COOH–Sn while concurrently forming intermolecular interactions with overlying perovskite crystals, manifested as CF3⋯H–N for formamidinium (FA+) and CF3⋯I–Pb, respectively. These interactions initiate the well-established beginning of the perovskite crystals and promote their vertical growth. Consequently, vertically grown perovskite crystals exhibit reduced tensile strain and fewer crystalline defects. Furthermore, a benign buried interface between the perovskite and underlying SnO2 mitigates detrimental damage, thereby suppressing non-radiative recombination losses. This synergetic bidirectional coordination contributes to the fabrication of perovskite solar cells with a maximum power conversion efficiency of 25.60% (certified at 25.39%) and long-term stability under light illumination.

Graphical abstract: Constructing orderly crystal orientation with a bidirectional coordinator for high efficiency and stable perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
08 May 2024
Accepted
09 Jul 2024
First published
11 Jul 2024
This article is Open Access
Creative Commons BY-NC license

Energy Environ. Sci., 2024,17, 6003-6012

Constructing orderly crystal orientation with a bidirectional coordinator for high efficiency and stable perovskite solar cells

J. Lee, Y. S. Shin, E. Oleiki, J. Seo, J. Roe, D. Lee, Y. Lee, T. Song, H. Jang, J. W. Song, W. Lee, G. Lee, J. Y. Kim and D. S. Kim, Energy Environ. Sci., 2024, 17, 6003 DOI: 10.1039/D4EE02017K

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