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Issue 4, 2021

22.8%-Efficient single-crystal mixed-cation inverted perovskite solar cells with a near-optimal bandgap

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Abstract

Expanding the near-infrared (NIR) response of perovskite materials to approach the ideal bandgap range (1.1–1.4 eV) for single-junction solar cells is an attractive step to unleash the full potential of perovskite solar cells (PSCs). However, polycrystalline formamidinium lead triiodide (FAPbI3)-based absorbers, used in record-efficiency PSCs, currently offer the smallest bandgap that can be achieved for lead-halide perovskite thin films (>100 meV larger than the optimal bandgap). Here, we uncover that utilizing a mixed-cation single-crystal absorber layer (FA0.6MA0.4PbI3) is capable of redshifting the external quantum efficiency (EQE) band edge past that of FAPbI3 polycrystalline solar cells by about 50 meV – only 60 meV larger than that of the top-performing photovoltaic material, GaAs – leading to EQE-verified short-circuit current densities exceeding 26 mA cm−2 without sacrificing the open-circuit voltage (VOC), and therefore, yielding power conversion efficiencies of up to 22.8%. These figures of merit not only set a new record for SC-PSCs and are among the highest reported for inverted-structured-PSCs, but also offer an avenue for lead halide PSCs to advance their performance toward their theoretical Shockley–Queisser Limit potential.

Graphical abstract: 22.8%-Efficient single-crystal mixed-cation inverted perovskite solar cells with a near-optimal bandgap

Supplementary files

Article information


Submitted
08 Dec 2020
Accepted
23 Feb 2021
First published
23 Feb 2021

This article is Open Access

Energy Environ. Sci., 2021,14, 2263-2268
Article type
Communication

22.8%-Efficient single-crystal mixed-cation inverted perovskite solar cells with a near-optimal bandgap

A. Y. Alsalloum, B. Turedi, K. Almasabi, X. Zheng, R. Naphade, S. D. Stranks, O. F. Mohammed and O. M. Bakr, Energy Environ. Sci., 2021, 14, 2263 DOI: 10.1039/D0EE03839C

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