Impact of Surfaces on Photoinduced Halide Segregation in Mixed-Halide Perovskites
| Autor: | Kevin A. Bush, Rebecca A. Belisle, Luca Bertoluzzi, Aryeh Gold-Parker, Michael D. McGehee, Michael F. Toney |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Energy Engineering and Power Technology Halide 02 engineering and technology engineering.material 010402 general chemistry Photochemistry 01 natural sciences chemistry.chemical_compound Coating Materials Chemistry Perovskite (structure) Tandem Renewable Energy Sustainability and the Environment Ligand business.industry 021001 nanoscience & nanotechnology 0104 chemical sciences Fuel Technology Semiconductor chemistry Chemistry (miscellaneous) engineering 0210 nano-technology business Trioctylphosphine oxide |
| Zdroj: | ACS Energy Letters. 3:2694-2700 |
| ISSN: | 2380-8195 |
| DOI: | 10.1021/acsenergylett.8b01562 |
| Popis: | Photoinduced halide segregation currently limits the perovskite chemistries available for use in high-bandgap semiconductors needed for tandem solar cells. Here, we study the impact of post-deposition surface modifications on photoinduced halide segregation in methylammonium lead mixed-halide perovskites. By coating a perovskite surface with the electron-donating ligand trioctylphosphine oxide (TOPO), we are able to both reduce nonradiative recombination and dramatically slow the onset of halide segregation in CH3NH3PbI2Br films. This result, coupled with the observation that the rate of halide segregation can be tuned by varying the selective contact, provides a direct link between surface modifications and photoinduced trap formation. On the basis of these observations, we discuss possible mechanisms for photoinduced halide segregation supported by drift-diffusion simulations. This work suggests that improved understanding and control of perovskite surfaces provides a pathway toward stable and high-perf... |
| Databáze: | OpenAIRE |
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