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- Title
Above 23% Efficiency by Binary Surface Passivation of Perovskite Solar Cells Using Guanidinium and Octylammonium Spacer Cations.
- Authors
Mozaffari, Naeimeh; Duong, The; Shehata, M. M.; Bui, Anh Dinh; Pham, Huyen T.; Yin, Yanting; Mayon, Y. Osorio; Zheng, Jianghui; Mahmud, Md Arafat; Tabi, Grace Dansoa; Andersson, Gunther G.; Black, Lachlan E.; Peng, Jun; Shen, Heping; White, Thomas P.; Weber, Klaus; Catchpole, Kylie R.
- Abstract
One of the important factors in the performance of perovskite solar cells (PSCs) is effective defect passivation. Dimensional engineering technique is a promising method to efficiently passivate non‐radiative recombination pathways in the bulk and surface of PSCs. Herein, a passivation approach for the perovskite/hole transport layer interface is presented, using a mixture of guanidinium and n‐octylammonium cations introduced via GuaBr and n‐OABr. The dual‐cation passivation layer can provide an open‐circuit voltage of 1.21 V with a power conversion efficiency of 23.13%, which is superior to their single cation counterparts. The mixed‐cation passivation layer forms a 1D/2D perovskite film on top of 3D perovskite, leading to a more hydrophobic and smoother surface than the uncoated film. A smooth surface can diminish non‐radiative recombination and enhance charge extraction at the interface making a better contact with the transport layer, resulting in improved short‐circuit current. In addition, space charge‐limited current measurements show a three times reduction in the trap‐filled limit voltage in the mixed‐cation passivated sample compared with unpassivated cells, indicating fewer trapped states. The shelf‐life stability test in ambient atmosphere with 60% relative humidity as well as light‐soaking stability reveal the highest stability for the dual‐cation surface passivation.
- Subjects
SURFACE passivation; SPACE charge; SOLAR cells; METHYLAMMONIUM; PEROVSKITE; GUANIDINE; OPEN-circuit voltage
- Publication
Solar RRL, 2022, Vol 6, Issue 8, p1
- ISSN
2367-198X
- Publication type
Article
- DOI
10.1002/solr.202200355