Abstract
Surface passivation of the perovskite photo absorber is a key factor to improve the photovoltaic performance. So far robust passivation strategies have not yet been revealed. Here, we demonstrate a successful passivation strategy which controls the Fermi-level of the perovskite surface by improving the surface states. Such Fermi-level control caused band-bending between the surface and bulk of the perovskite, which enhanced the hole-extraction from the absorber bulk to the HTM side. As an added benefit, the inorganic passivation layer improved the device light stability. By depositing a thick protection layer on the complete device, a remarkable waterproofing effect was obtained. As a result, an enhancement of VOC and the conversion efficiency from 20.5% to 22.1% was achieved. We revealed these passivation mechanisms and used perhydropoly(silazane) (PHPS) derived silica to control the perovskite surface states.
Original language | English |
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Pages (from-to) | 1222-1230 |
Number of pages | 9 |
Journal | Energy and Environmental Science |
Volume | 13 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2020 |
Bibliographical note
Funding Information:The authors acknowledge financial support from CTI 25590.1 PFNM-NM, Solaronix, Aubonne, Switzerland, Toyota Motor Corporation, US Army grant agreement no. W911NF-17-2-0122 and Toyota Motor Technical Centre, Advanced Technology Div., Hoge Wei 33, B-1930 Zaventum, Belgium. We thank Dr N. Valle, Dr P. Gratia, Dr B. E. Adib, and Dr J.-N. Audinoz at the Luxembourg Institute of Science and Technology for device characterization; and Dr S. Yasuno, and Dr T. Koganezawa at the Japan Synchrotron Radiation Research Institute (JASRI) and Y. Nakamura at Univ. Tokyo for discussions. The 2D-WAXS measurement was performed at SPring-8 at BL19B2 with the approval of the JASRI, proposal no. 2018B1809, 2018B1855 and 2018B1862, and the X-ray photoelectron spectroscopy measurement at SPring-8 at BL46XU with the approval of the JASRI, proposal no. 2018B1868 and 2019A1719. M. Li would like to thank the China Scholarship Council for a PhD grant (Grant No. 201506060156). The author acknowledge the Swiss National Science Foundation (SNSF) funding through the Ambizione Energy Project No. 646 HYPER (Grant No. PZENP2173641). The research leading to these results had received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 763977 of the PerTPV project. We acknowledge SNSF for financial support of the project: Tailored Design and in-depth understanding of perovskite solar materials using in-house developed 3D/4D nanoscale ion-beam analysis, project number:200020L_1729/1. N. Klipfel thanks the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 764787.
Publisher Copyright:
© The Royal Society of Chemistry.
ASJC Scopus subject areas
- Environmental Chemistry
- Renewable Energy, Sustainability and the Environment
- Nuclear Energy and Engineering
- Pollution