Issue 31, 2019

Molecular modulator for stable inverted planar perovskite solar cells with efficiency enhanced by interface engineering

Abstract

Hybrid organic/inorganic organometal halide perovskite solar cells (PSCs) have been attracting enormous research interest. However, their performance improvement and engineering at the molecular level remain challenging for the inverted structures. Surface traps present in semiconductor films critically influence ultimate photovoltaic behaviors. A solution-processable and stable cathode buffer layer that can passivate surface traps is thus of great importance for the application of PSCs. Here, we successfully fabricated high performance and stable inverted planar PSCs by employing calcium acetylacetonate (Ca(acac)2), a molecular modulator, as the cathode interfacial layer (CIL). The average power conversion efficiencies of PSCs based on different perovskite photoactive layers were improved. Strikingly, FA0.85MA0.15Pb(I0.85Br0.15)3-based and MAPbI3-based PSC devices were found to have champion power conversion efficiencies of 20.15% and 18.23%, respectively. Importantly, Ca(acac)2-modified PSCs also have high stability. Their power conversion efficiencies decreased by only 15% after 30 days of storage and they show much suppressed hysteresis compared with the control devices (without interfacial modification).

Graphical abstract: Molecular modulator for stable inverted planar perovskite solar cells with efficiency enhanced by interface engineering

Supplementary files

Article information

Article type
Paper
Submitted
18 Jun 2019
Accepted
16 Jul 2019
First published
17 Jul 2019

J. Mater. Chem. C, 2019,7, 9735-9742

Molecular modulator for stable inverted planar perovskite solar cells with efficiency enhanced by interface engineering

Z. Q. Zhao, S. You, J. Huang, L. Yuan, Z. Y. Xiao, Y. Cao, N. Cheng, L. Hu, J. F. Liu and B. H. Yu, J. Mater. Chem. C, 2019, 7, 9735 DOI: 10.1039/C9TC03259B

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