Issue 33, 2017

Extra long electron–hole diffusion lengths in CH3NH3PbI3−xClx perovskite single crystals

Abstract

Long electron–hole diffusion lengths in organolead trihalide compounds play a key role in achieving the remarkable performance of perovskite photovoltaics. Diffusion lengths in solution-grown CH3NH3PbI3 single crystals have been found to be greater than 175 micrometer (μm). Herein, we report the diffusion lengths in CH3NH3PbI3−xClx single crystals exceeding 380 μm under 1 Sun illumination, which is twice that in CH3NH3PbI3 single crystals. Incorporation of chlorine is found to increase the density of trap-states and reduce the valence band level; these two factors, which dominate the carrier recombination and the charge transfer, respectively, are in a competing relation. As a result, the electron–hole diffusion lengths in a CH3NH3PbI3−xClx single crystal with an optimum Cl proportion (x = 0.005) reach the maximum values. This study provides a strategy for the design of perovskite optoelectronics.

Graphical abstract: Extra long electron–hole diffusion lengths in CH3NH3PbI3−xClx perovskite single crystals

Supplementary files

Article information

Article type
Paper
Submitted
23 juin 2017
Accepted
21 juil. 2017
First published
22 juil. 2017

J. Mater. Chem. C, 2017,5, 8431-8435

Extra long electron–hole diffusion lengths in CH3NH3PbI3−xClx perovskite single crystals

F. Zhang, B. Yang, Y. Li, W. Deng and R. He, J. Mater. Chem. C, 2017, 5, 8431 DOI: 10.1039/C7TC02802D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements