Bifunctional Ultrathin PCBM Enables Passivated Trap States and Cascaded Energy Level toward Efficient Inverted Perovskite Solar Cells.,ACS Applied Materials & Interfaces

当前位置： X-MOL 学术 › ACS Appl. Mater. Interfaces › 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.)

Bifunctional Ultrathin PCBM Enables Passivated Trap States and Cascaded Energy Level toward Efficient Inverted Perovskite Solar Cells.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-14 , DOI: 10.1021/acsami.0c02837
Dongyang Li _{1,

2} , Weiguang Kong ₃ , Haichao Zhang ₁ , Deng Wang ₁ , Wang Li ₁ , Changwen Liu ₁ , Hong Chen ₁ , Weidong Song ₄ , Fangliang Gao ₂ , Abbas Amini ₅ , Baomin Xu _{1,

6,

7} , Shuti Li ₂ , Chun Cheng _{1,

6,

7}

Affiliation

Inverted perovskite solar cells (PSCs) with a C60 framework are known for their common drawback of low power conversion efficiency (PCE) of <20% because of nonradiative recombination and inefficient charge transport at their perovskite interfaces. Here, we report an ultrathin [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as a cap layer on perovskite films to overcome this issue. Such a functional cap layer efficiently passivates trap states and establishes a gradient energy level alignment onto perovskite, facilitating the efficient charge transfer and extraction. The as-fabricated inverted PSCs capped with such ultrathin PCBM exhibit a record PCE of 20.07%. After the storage under a N2 atmosphere for more than 500 h, the PCE of PSCs retains over 85% of its initial level. Our work provides an effective method to upgrade inverted PSCs with the C60 framework with improved efficiency and stability.

中文翻译：

双功能超薄PCBM可使钝化的陷阱态和级联能级朝向高效的反向钙钛矿太阳能电池。

具有C60框架的钙钛矿型太阳能电池（PSC）的常见缺点是，其钙钛矿界面处的非辐射复合和电荷传输效率低，因此其功率转换效率（PCE）低于20％。在这里，我们报道了一种超薄[6,6]-苯基-C61-丁酸甲酯（PCBM）作为钙钛矿薄膜上的覆盖层，以克服这一问题。这样的功能性盖层有效地钝化了陷阱态，并在钙钛矿上建立了梯度能级对准，从而促进了有效的电荷转移和提取。覆有这种超薄PCBM的倒置PSC的PCE达到了创纪录的20.07％。在氮气气氛下存储500小时以上后，PSC的PCE保持其初始水平的85％以上。

更新日期：2020-04-23

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