TY - JOUR
T1 - Band-bending induced passivation
T2 - High performance and stable perovskite solar cells using a perhydropoly(silazane) precursor
AU - Kanda, Hiroyuki
AU - Shibayama, Naoyuki
AU - Huckaba, Aron Joel
AU - Lee, Yonghui
AU - Paek, Sanghyun
AU - Klipfel, Nadja
AU - Roldán-Carmona, Cristina
AU - Queloz, Valentin Ianis Emmanuel
AU - Grancini, Giulia
AU - Zhang, Yi
AU - Abuhelaiqa, Mousa
AU - Cho, Kyung Taek
AU - Li, Mo
AU - Mensi, Mounir Driss
AU - Kinge, Sachin
AU - Nazeeruddin, Mohammad Khaja
N1 - Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2020/4
Y1 - 2020/4
N2 - 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.
AB - 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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U2 - 10.1039/c9ee02028d
DO - 10.1039/c9ee02028d
M3 - Article
AN - SCOPUS:85082036047
SN - 1754-5692
VL - 13
SP - 1222
EP - 1230
JO - Energy and Environmental Science
JF - Energy and Environmental Science
IS - 4
ER -