Overcoming Charge Confinement in Perovskite Nanocrystal Solar Cells,Advanced Materials

当前位置： X-MOL 学术 › Adv. Mater. › 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.)

Overcoming Charge Confinement in Perovskite Nanocrystal Solar Cells
Advanced Materials ( IF 27.4 ) Pub Date : 2023-06-30 , DOI: 10.1002/adma.202304533
Wenqiang Yang _{1,

2} , Seung-Hyeon Jo ₁ , Yipeng Tang ₃ , Jumi Park ₄ , Su Geun Ji ₁ , Seong Ho Cho ₅ , Yongseok Hong ₄ , Dong-Hyeok Kim ₁ , Jinwoo Park ₁ , Eojin Yoon ₁ , Huanyu Zhou ₁ , Seung-Je Woo ₁ , Hyeran Kim ₆ , Hyung Joong Yun ₆ , Yun Seog Lee ₅ , Jin Young Kim ₁ , Bin Hu ₃ , Tae-Woo Lee _{1,

2,

7,

8}

Affiliation

The small nanoparticle size and long-chain ligands in colloidal metal halide perovskite quantum dots (PeQDs) cause charge confinement, which impedes exciton dissociation and carrier extraction in PeQD solar cells, so they have low short-circuit current density J_sc, which impedes further increases in their power conversion efficiency (PCE). Here, a re-assembling process (RP) is developed for perovskite nanocrystalline (PeNC) films made of colloidal perovskite nanocrystals to increase J_sc in PeNC solar cells. The RP of PeNC films increases their crystallite size and eliminates long-chain ligands, and thereby overcomes the charge confinement in PeNC films. These changes facilitate exciton dissociation and increase carrier extraction in PeNC solar cells. By use of this method, the gradient-bandgap PeNC solar cells achieve a J_sc = 19.30 mA cm⁻² without compromising the photovoltage, and yield a high PCE of 16.46% with negligible hysteresis and good stability. This work provides a new strategy to process PeNC films and pave the way for high performance PeNC optoelectronic devices.

中文翻译：

克服钙钛矿纳米晶体太阳能电池中的电荷限制

胶体金属卤化物钙钛矿量子点（PeQD）中的小纳米颗粒尺寸和长链配体会导致电荷限制，阻碍PeQD太阳能电池中的激子解离和载流子提取，因此它们具有较低的短路电流密度J sc ，这阻碍了进一步_的发展提高其功率转换效率（PCE）。在这里，开发了一种由胶体钙钛矿纳米晶体制成的钙钛矿纳米晶体（PeNC）薄膜的重新组装工艺（RP），以增加PeNC太阳能电池中的J _{sc 。}PeNC 薄膜的 RP 增加了其微晶尺寸并消除了长链配体，从而克服了 PeNC 薄膜中的电荷限制。这些变化促进了激子解离并增加了 PeNC 太阳能电池中的载流子提取。通过使用这种方法，梯度带隙PeNC太阳能电池在不影响光电压的情况下实现了J _sc = 19.30 mA cm ^{-2 ，并产生了16.46%的高PCE，滞后现象可以忽略不计，稳定性良好。}这项工作提供了一种处理PeNC薄膜的新策略，为高性能PeNC光电器件铺平了道路。

更新日期：2023-06-30

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南