Understanding the interplay between the crystal structure and charge transport in alloyed lead-free perovskites

Aleksandra G. Boldyreva, Shijing Sun, Polly J. Pierone, Filipp Talalaev, Janak Thapa, Noor Titan Putri Hartono, Meng Ju Sher, Tonio Buonassisi, Pavel A. Troshin, Keith J. Stevenson

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, we studied the impact of Pb-free perovskite compositions on various properties including the crystal structure, carrier mobility and lifetime, photoresponse in lateral devices, and photostability. We focused on a set of materials with the general formula MA3B2X9, where MA is the methylammonium cation, B stands for a Sb or Bi cation and X is a Br or I anion. I-Br alloying results in a structural modification from 0D to 2D configuration upon 40% Br addition. This structural change, however, did not impact carrier transport properties, while synthesis parameters have a strong impact on the carrier lifetime. Moreover, there is no direct correlation between the material dimensionality and responsivity values in lateral devices. Bi replacement with Sb as well as a low Br content is the key to high performance in photodetectors in a wide wavelength range. We also observe clear performance-stability trade-offs that the best-performing systems in lateral devices are the least stable due to the volatile nature of Sb atoms. Thus, when choosing a specific material for optoelectronics, one should trade between the two parameters, sacrificing either the responsivity or the lifetime of the device. This journal is

Original languageEnglish
Pages (from-to)5454-5460
Number of pages7
JournalSustainable Energy and Fuels
Volume5
Issue number21
DOIs
Publication statusPublished - 7 Nov 2021

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