Journal
ACS ENERGY LETTERS
Volume 7, Issue 10, Pages 3302-3310Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.2c01636
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Funding
- European Research Council (ERC) under the European Union?s Horizon 2020 research and innovation programme (ERC)
- Deutsche Forschungsge- meinschaft (DFG)
- Belgian National Fund for Scientific Research (F.R.S.-FNRS)
- Walloon Region
- Ministry of Science & Technology, Israel
- Technion Ollendorff Minerva Center
- [714067]
- [SPP 2196]
- [424216076]
- [2.5020.11]
- [1117545]
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The mixed ionic-electronic nature of lead halide perovskites makes their performance in solar cells complex in nature. However, this study demonstrates that ion trapping at the perovskite/electron transport layer interface can have a positive impact on device performance of perovskite solar cells, despite the presence of high-density ionic defects.
The mixed ionic???electronic nature of lead halide perovskites makes their performance in solar cells complex in nature. Ion migration is often associated with negative impacts -such as hysteresis or device degradation -leading to significant efforts to suppress ionic movement in perovskite solar cells. In this work, we demonstrate that ion trapping at the perovskite/electron transport layer interface induces band bending, thus increasing the built-in potential and open-circuit voltage of the device. Quantum chemical calculations reveal that iodine interstitials are stabilized at that interface, effectively trapping them at a remarkably high density of ???1021 cm???3 which causes the band bending. Despite the presence of this high density of ionic defects, the electronic structure calculations show no sub-band-gap states (electronic traps) are formed due to a pronounced perovskite lattice reorganization. Our work demonstrates that ionic traps can have a positive impact on device performance of perovskite solar cells.
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