Two-dimensional perovskite solar cells with high luminescence and ultra-low open-circuit voltage deficit

Xiaomei Lian, Lijian Zuo, Haotian Wu, Guanqing Zhou, Chen Lin, Haiming Zhu, Gang Wu, David Cahen, Hongzheng Chen

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

High luminescence efficiency of the halide perovskite absorber layer in perovskite solar cells (PVSCs) will reduce the open-circuit voltage (Voc) loss and further increase the cell efficiency. Still, while quasi-2D-structure perovskite films exhibit high emissivity in light-emitting devices, quasi-2D PVSCs show severe Voc loss associated with non-radiative recombination. Here we demonstrate how the use of highly luminescent PEA0.2BA1.8MA3Pb4I13 in quasi-2D PVSCs allows, via Cl- passivation and heat-light post-co-treatment, a champion external electroluminescence quantum efficiency around 2.3% and a record low Voc deficit of 0.36 eV. To our knowledge, this is the lowest Voc loss for quasi-2D PVSCs and among the lowest for any type of PVSCs. As a result, high performance quasi-2D PVSCs are obtained, with a Voc up to 1.29 V and 15.81% efficiency, showing excellent stability, and retain 98% of the original efficiency after heating at 85 °C for 1590 h. This work paves the way toward highly luminescent and efficient quasi-2D PVSCs.

Original languageEnglish
Pages (from-to)22175-22180
Number of pages6
JournalJournal of Materials Chemistry A
Volume8
Issue number42
DOIs
StatePublished - 14 Nov 2020

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry.

Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 51961145301, 51620105006, 51973184 and 61721005), the Israel Science Foundation, the National Key Research and Development Program of China (No. 2019YFA0705900) and the Key Research Project of Southern Xinjiang (No. 2019DB013). The authors thank Prof. Yizheng Jin for his kind support in measuring the ELQE in his lab.

FundersFunder number
Key Research Project of Southern Xinjiang
National Natural Science Foundation of China51961145301, 51973184, 61721005, 51620105006
Israel Science Foundation
National Key Research and Development Program of China2019YFA0705900
Xinjiang Southern Xinjiang Key Industry Innovation and Development Support Project2019DB013

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