Band-bending induced passivation: high performance and stable perovskite solar cells using a perhydropoly(silazane) precursor,Energy & Environmental Science

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Band-bending induced passivation: high performance and stable perovskite solar cells using a perhydropoly(silazane) precursor
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2019-11-06 , DOI: 10.1039/c9ee02028d
Hiroyuki Kanda _{1,

2,

3,

4} , Naoyuki Shibayama _{5,

6,

7,

8,

9} , Aron Joel Huckaba _{1,

2,

3,

4} , Yonghui Lee _{1,

2,

3,

4} , Sanghyun Paek _{1,

2,

3,

4} , Nadja Klipfel _{1,

2,

3,

4} , Cristina Roldán-Carmona _{1,

2,

3,

4} , Valentin Ianis Emmanuel Queloz _{1,

2,

3,

4} , Giulia Grancini _{1,

2,

3,

4} , Yi Zhang _{1,

2,

3,

4} , Mousa Abuhelaiqa _{1,

2,

3,

4} , Kyung Taek Cho _{1,

2,

3,

4} , Mo Li _{2,

3,

4,

10,

11} , Mounir Driss Mensi _{2,

3,

4,

12} , Sachin Kinge _{13,

14,

15,

16,

17} , Mohammad Khaja Nazeeruddin _{1,

2,

3,

4}

Affiliation

Group for Molecular Engineering of Functional Materials
École Polytechnique Fédérale de Lausanne
CH-1951 Sion
Switzerland
Department of General Systems Studies
Graduate School of Arts and Sciences
The University of Tokyo
Tokyo 153-8902
Japan
Laboratory of Materials for Renewable Energy
Swiss Federal Laboratories for Materials Science and Technology
Institute of Chemical Sciences and Engineering
Toyota Motor Corporation
Toyota Motor Technical Centre
Advanced Technology Div.
B-1930 Zaventum
Belgium

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 V_OC 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.

中文翻译：

带弯曲诱导钝化：使用全氢聚硅氮烷前体的高性能且稳定的钙钛矿太阳能电池

钙钛矿光吸收剂的表面钝化是提高光伏性能的关键因素。到目前为止，还没有显示出强大的钝化策略。在这里，我们展示了一种成功的钝化策略，可通过改善表面态来控制钙钛矿表面的费米能级。这种费米能级控制引起钙钛矿表面和块体之间的能带弯曲，从而增强了从吸收体块体到HTM侧的空穴提取。另外一个好处是，无机钝化层改善了器件的光稳定性。通过在整个设备上沉积厚的保护层，可获得显着的防水效果。作为结果，增强V _OC转化效率从20.5％提高到22.1％。我们揭示了这些钝化机理，并使用了过氢聚（硅氮烷）（PHPS）衍生的二氧化硅来控制钙钛矿的表面状态。

更新日期：2019-11-06

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