Boosted charge extraction of NbOx-enveloped SnO2 nanocrystals enables 24% efficient planar perovskite solar cells,Energy & Environmental Science

当前位置： X-MOL 学术 › Energy Environ. Sci. › 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.)

Boosted charge extraction of NbOx-enveloped SnO2 nanocrystals enables 24% efficient planar perovskite solar cells
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2021-07-17 , DOI: 10.1039/d1ee01519b
Ruihan Yuan ₁ , Bing Cai ₁ , Yinhua Lv ₁ , Xiang Gao ₂ , Jinwen Gu ₃ , Zhenghui Fan ₁ , Xinhang Liu ₁ , Chi Yang ₄ , Mingzhen Liu ₄ , Wen-Hua Zhang ₁

Affiliation

Planar perovskite solar cells (PSCs) have attracted extensive research attention owing to their simple architecture and manufacturing process. Improving the charge extraction ability of electron transport materials (ETMs) is imperative to enhance their power conversion efficiencies (PCEs). Herein, we report low-temperature solution-processed SnO₂ nanocrystals (SnO₂ NCs) enveloped by amorphous NbO_x (SnO₂/NbO_x) as efficient ETMs for planar PSCs, achieving an impressive PCE of 24.01% with negligible hysteresis, which is significantly superior to that of PSCs made from commercial SnO₂ (with PCEs up to 21.96%) and self-developed SnO₂ NCs (with PCEs up to 23.01%). The NbO_x layer can simultaneously passivate defects at the ETMs/perovskite interface, promote charge extraction from perovskites, and improve the crystallinity of perovskite films. The unencapsulated PSC retains over 85% of its initial efficiency after 1000 h of light soaking (one sun), showing remarkable device stability. Furthermore, the low-temperature processed SnO₂/NbO_x ETMs are compatible with flexible substrates and present a maximum PCE of 20.00%. This work offers a facile approach to low-temperature processed ETMs with boosted carrier extraction ability, affording excellent device efficiency and stability for planar PSCs.

中文翻译：

NbOx 包覆的 SnO2 纳米晶体的增强电荷提取使平面钙钛矿太阳能电池的效率达到 24%

平面钙钛矿太阳能电池（PSC）由于其简单的结构和制造工艺而引起了广泛的研究关注。提高电子传输材料 (ETM) 的电荷提取能力对于提高其功率转换效率 (PCE) 势在必行。在此，我们报告了低温溶液处理的 SnO ₂纳米晶体 (SnO ₂ NCs) 被无定形 NbO _x (SnO ₂ /NbO _x )包裹，作为用于平面 PSC 的有效 ETM，实现了令人印象深刻的 24.01% 的 PCE，滞后可忽略不计，这是明显优于由商业 SnO ₂制成的 PSC （PCE 高达 21.96%）和自主开发的 SnO ₂NC（PCE 高达 23.01%）。NbO _x层可以同时钝化 ETMs/钙钛矿界面处的缺陷，促进钙钛矿的电荷提取，并提高钙钛矿薄膜的结晶度。未封装的 PSC 在光照 1000 小时（一个太阳）后仍保持其初始效率的 85% 以上，显示出显着的器件稳定性。此外，低温处理的 SnO ₂ /NbO _x ETM 与柔性基板兼容，并具有 20.00% 的最大 PCE。这项工作为低温处理 ETM 提供了一种简便的方法，具有增强的载流子提取能力，为平面 PSC 提供了出色的器件效率和稳定性。

更新日期：2021-08-13

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