Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 22, Pages 13777-13786Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta02772f
Keywords
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Funding
- National Science Foundation of China [51872014]
- Fundamental Research Funds for the Central Universities
- Recruitment Program of Global Experts
- Goran Gustafsson Foundation
- Swedish Energy Agency
- Swedish Research Council FORMAS
- Swedish Research Council (VR)
- LOTUS+ program from Erasmus Mundus
- AForsk
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The interfacial properties between a perovskite layer and carbon electrode are critical for the photovoltaic performance of carbon electrode-based perovskite solar cells (PSCs). Herein, a methylammonium lead mixed halide (MAPbI(x)Br(3-x)) perovskite layer is in situ grown on the top of a methylammonium lead iodide (MAPbI(3)) perovskite layer forming a MAPbI(3)/MAPbI(x)Br(3-x) perovskite stacking structure (PSS) to improve the interfacial properties at the perovskite/carbon electrode interface. The charge carrier dynamics in both the perovskite and the PSC device induced by the MAPbI(x)Br(3-x) perovskite stacking layer are studied using extensive characterization. The charge interfacial recombination at the perovskite/carbon electrode interface is significantly diminished using the PSS within the PSC, resulting in largely improved charge extraction and therefore high photovoltaic performance. The PSS-based PSC shows a power conversion efficiency of up to 16.2% (increased by 43% compared with that of a conventional MAPbI(3)-based PSC), which is among the highest efficiencies of carbon electrode-based hole conductor free PSCs. Meanwhile, the PSS-based PSC also exhibits good stability under both continuous illumination and storage under dark conditions. This work may provide a new avenue to fine tune the interfacial properties of carbon electrode-based PSCs for further improving their photovoltaic performance.
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