Issue 42, 2019, Issue in Progress

Additive effects of alkali metals on Cu-modified CH3NH3PbI3−δClδ photovoltaic devices

Abstract

We investigated the addition of alkali metal elements (namely Na+, K+, Rb+, and Cs+) to Cu-modified CH3NH3PbI3−δClδ photovoltaic devices and their effects on the photovoltaic properties and electronic structure. The open-circuit voltage was increased by CuBr2 addition to the CH3NH3PbI3−δClδ precursor solution. The series resistance was decreased by simultaneous addition of CuBr2 and RbI, which increased the external quantum efficiencies in the range of 300–500 nm, and the short-circuit current density. The energy gap of the perovskite crystal increased through CuBr2 addition, which we also confirmed by first-principles calculations. Charge carrier generation was observed in the range of 300–500 nm as an increase of the external quantum efficiency, owing to the partial density of states contributed by alkali metal elements. Calculations suggested that the Gibbs energies were decreased by incorporation of alkali metal elements into the perovskite crystals. The conversion efficiency was maintained for 7 weeks for devices with added CuBr2 and RbI.

Graphical abstract: Additive effects of alkali metals on Cu-modified CH3NH3PbI3−δClδ photovoltaic devices

Supplementary files

Article information

Article type
Paper
Submitted
25 Apr 2019
Accepted
24 Jul 2019
First published
05 Aug 2019
This article is Open Access
Creative Commons BY license

RSC Adv., 2019,9, 24231-24240

Additive effects of alkali metals on Cu-modified CH3NH3PbI3−δClδ photovoltaic devices

N. Ueoka, T. Oku and A. Suzuki, RSC Adv., 2019, 9, 24231 DOI: 10.1039/C9RA03068A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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