%0 Journal Article %1 doi:10.1021/acs.jpclett.7b02160 %A Zhang, Teng %A Cheung, Sin Hang %A Meng, Xiangyue %A Zhu, Lei %A Bai, Yang %A Ho, Carr Hoi Yi %A Xiao, Shuang %A Xue, Qingzhong %A So, Shu Kong %A Yang, Shihe %D 2017 %J The Journal of Physical Chemistry Letters %K lightsoaking perovskite %N 20 %P 5069-5076 %R 10.1021/acs.jpclett.7b02160 %T Pinning Down the Anomalous Light Soaking Effect toward High-Performance and Fast-Response Perovskite Solar Cells: The Ion-Migration-Induced Charge Accumulation %U http://dx.doi.org/10.1021/acs.jpclett.7b02160 %V 8 %X The light soaking effect (LSE) is widely known in perovskite solar cells (PVSCs), but its origin is still elusive. In this study, we show that in common with hysteresis, the LSE is owed to the ion migration in PVSCs. Driven by the photovoltage, the mobile ions in the perovskite materials (MA+/I–) migrate to the selective contacts, forming a boosted P-i-N junction resulting in enhanced charge separation. Besides, the mobile ions (MA+) can soften and suture the PCBM/perovskite interface and thus reduce the trap density, in keeping with a higher open-circuit voltage. Finally, almost LSE-free PVSCs can be prepared by using 0.1 wt \% MAI-doped PCBM as the electron transport material, whereas overdoping (1 wt \% MAI doping) makes the LSE even more pronounced due to excess mobile ions that need time to migrate to reach a new quasi-static state.

@article{doi:10.1021/acs.jpclett.7b02160, abstract = { The light soaking effect (LSE) is widely known in perovskite solar cells (PVSCs), but its origin is still elusive. In this study, we show that in common with hysteresis, the LSE is owed to the ion migration in PVSCs. Driven by the photovoltage, the mobile ions in the perovskite materials (MA+/I–) migrate to the selective contacts, forming a boosted P-i-N junction resulting in enhanced charge separation. Besides, the mobile ions (MA+) can soften and suture the PCBM/perovskite interface and thus reduce the trap density, in keeping with a higher open-circuit voltage. Finally, almost LSE-free PVSCs can be prepared by using 0.1 wt \% MAI-doped PCBM as the electron transport material, whereas overdoping (1 wt \% MAI doping) makes the LSE even more pronounced due to excess mobile ions that need time to migrate to reach a new quasi-static state. }, added-at = {2017-10-20T18:11:59.000+0200}, author = {Zhang, Teng and Cheung, Sin Hang and Meng, Xiangyue and Zhu, Lei and Bai, Yang and Ho, Carr Hoi Yi and Xiao, Shuang and Xue, Qingzhong and So, Shu Kong and Yang, Shihe}, biburl = {https://www.bibsonomy.org/bibtex/287052955038b5332e0dad988be4d3d2c/cgoehler}, description = {Pinning Down the Anomalous Light Soaking Effect toward High-Performance and Fast-Response Perovskite Solar Cells: The Ion-Migration-Induced Charge Accumulation - acs.jpclett.7b02160}, doi = {10.1021/acs.jpclett.7b02160}, eprint = {http://dx.doi.org/10.1021/acs.jpclett.7b02160}, interhash = {f360b318e5de64bfa4755bca6849c559}, intrahash = {87052955038b5332e0dad988be4d3d2c}, journal = {The Journal of Physical Chemistry Letters}, keywords = {lightsoaking perovskite}, note = {PMID: 28967248}, number = 20, pages = {5069-5076}, timestamp = {2017-10-20T18:11:59.000+0200}, title = {Pinning Down the Anomalous Light Soaking Effect toward High-Performance and Fast-Response Perovskite Solar Cells: The Ion-Migration-Induced Charge Accumulation}, url = {http://dx.doi.org/10.1021/acs.jpclett.7b02160}, volume = 8, year = 2017 }