Photoactivated transition metal dichalcogenides to boost electron extraction for all-inorganic tri-brominated planar perovskite solar cells,Journal of Materials Chemistry A

当前位置： X-MOL 学术 › J. Mater. Chem. A › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Photoactivated transition metal dichalcogenides to boost electron extraction for all-inorganic tri-brominated planar perovskite solar cells
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-04-01 , DOI: 10.1039/d0ta01645d
Qingwei Zhou _{1,

2,

3,

4,

5} , Jian Du _{1,

2,

3,

4,

5} , Jialong Duan _{1,

2,

3,

4,

5} , Yudi Wang _{1,

2,

3,

4,

5} , Xiya Yang _{1,

2,

3,

4,

5} , Yanyan Duan _{5,

6,

7,

8,

9} , Qunwei Tang _{1,

2,

3,

4,

5}

Affiliation

The band-energy structure, electron mobility and electronic trap states of the electron-transporting layer (ETL) are critical for perovskite solar cells (PSCs). However, the state-of-the-art titanium oxide (TiO₂) ETL prepared by means of high-temperature processing technology requires a long preparation time and a lot of energy consumption; and the low-temperature processed species always present unfavourable electrical properties. In this work, we demonstrate that photoactivated transition metal dichalcogenide quantum dots (TMDC QDs, MoS₂ and MoSe₂) boosted a low-temperature processed TiO₂ (L-TiO₂) ETL for all-inorganic CsPbBr₃ PSCs without a hole-transporting layer or precious metal electrode. Arising from the photogenerated electron injection from TMDC QDs to L-TiO₂ under light irradiation, the electronic trap states and the electron mobility of ETL were effectively regulated, which in turn significantly enhanced the electron extraction from perovskite to the L-TiO₂ ETL and reduced the carrier recombination. Finally, the optimal CsPbBr₃ PSC achieves an enhanced power conversion efficiency of 10.02% with an ultrahigh open-circuit voltage of 1.615 V and excellent long-term stability, providing a new path to efficient photovoltaic devices.

中文翻译：

光活化过渡金属二卤化物可促进全无机三溴化平面钙钛矿太阳能电池的电子提取

电子传输层（ETL）的能带结构，电子迁移率和电子陷阱状态对于钙钛矿太阳能电池（PSC）至关重要。然而，通过高温加工技术制备的最新的二氧化钛（TiO ₂）ETL需要较长的制备时间和大量的能量消耗；并且低温处理的物质总是表现出不利的电性能。在这项工作中，我们证明了光活化过渡金属_二硫化二硫量子点（TMDC QDs，MoS ₂和MoSe ₂）促进了全无机CsPbBr ₃的低温处理TiO ₂（L-TiO ₂）ETL。没有空穴传输层或贵金属电极的PSC。由于TMDC量子点在光照射下向L-TiO ₂注入光生电子，有效地调节了ETL的电子陷阱态和电子迁移率，从而显着增强了钙钛矿对L-TiO ₂ ETL的电子提取。减少了载子重组。最后，最佳的CsPbBr ₃ PSC具有1.615 V的超高开路电压和出色的长期稳定性，可实现10.02％的增强功率转换效率，为高效光伏器件提供了一条新途径。

更新日期：2020-04-01

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11