Issue 18, 2022

Copper-incorporation for polytypism and bandgap engineering of MAPbBr3 perovskite thin films with enhanced near-Infrared photocurrent-response

Abstract

The optoelectronic properties of lead-based halide perovskites can be enhanced through B-site engineering. Here, we studied the B-site alloying of MAPbBr3 thin films with copper (Cu2+). The alloyed perovskite thin films were characterized by a dark color, enlarged average grain boundary, and lowering of the optical bandgap from 2.32 eV for pristine MAPbBr3 to 1.85 eV for 50% Cu-substituted MAPbBr3. Various characterization methods revealed that the Cu-incorporation leads to the appearance of a Cu-rich secondary phase. The conductivity increased over three orders of magnitude upon alloying. Temperature-dependent conductivity measurements at temperatures ranging from 110 K to 300 K revealed the occurrence of two phase-transitions in Cu-substituted perovskite, and only one transition in pristine MAPbBr3. Photocurrent measurements of the alloyed perovskites showed that band-carrier generation occurred upon excitation in the near-infrared region. First-principles point defect calculation shows the likelihood of compensating Br vacancy formation with high Cu-substituting concentrations. Calculation of atomic orbital projected density of states (CuPb + vBr defect complex) revealed the presence of localized defect states within the pristine bandgap, explaining the observed sub-bandgap absorption. The results provide an insight into the alloying importance in phase-modulation and tailoring the optoelectronic properties of perovskites for a wide range of efficient optoelectronic devices.

Graphical abstract: Copper-incorporation for polytypism and bandgap engineering of MAPbBr3 perovskite thin films with enhanced near-Infrared photocurrent-response

Supplementary files

Article information

Article type
Research Article
Submitted
26 May 2022
Accepted
02 Aug 2022
First published
02 Aug 2022

Mater. Chem. Front., 2022,6, 2690-2702

Copper-incorporation for polytypism and bandgap engineering of MAPbBr3 perovskite thin films with enhanced near-Infrared photocurrent-response

A. Elattar, J. Kangsabanik, K. Nakao, K. Tsutsumi, H. Suzuki, T. Nishikawa, K. S. Thygesen and Y. Hayashi, Mater. Chem. Front., 2022, 6, 2690 DOI: 10.1039/D2QM00491G

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