Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 13, Issue 4, Pages 1222-1230Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ee02028d
Keywords
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Funding
- Solaronix, Aubonne, Switzerland [CTI 25590.1 PFNM-NM]
- US Army [W911NF-17-2-0122]
- Toyota Motor Technical Centre, Advanced Technology Div., Zaventum, Belgium
- China Scholarship Council [201506060156]
- Swiss National Science Foundation (SNSF) [646 HYPER, PZENP2173641]
- European Union's Horizon 2020 research and innovation programme of the PerTPV project [763977]
- SNSF [200020L_1729/1]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [764787]
- Toyota Motor Corporation
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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.
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