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Surface Defects Management by In Situ Etching with Methanol for Efficient Inverted Inorganic Perovskite Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-03-15 , DOI: 10.1002/adfm.202213913
Hongrui Sun 1, 2, 3, 4, 5 , Sanlong Wang 1, 2, 3, 4, 5 , Shanshan Qi 1, 2, 3, 4, 5 , Pengyang Wang 1, 2, 3, 4, 5 , Renjie Li 1, 2, 3, 4, 5 , Biao Shi 1, 2, 3, 4, 5 , Qixing Zhang 1, 2, 3, 4, 5 , Qian Huang 1, 2, 3, 4, 5 , Shengzhi Xu 1, 2, 3, 4, 5 , Ying Zhao 1, 2, 3, 4, 5 , Xiaodan Zhang 1, 2, 3, 4, 5
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-03-15 , DOI: 10.1002/adfm.202213913
Hongrui Sun 1, 2, 3, 4, 5 , Sanlong Wang 1, 2, 3, 4, 5 , Shanshan Qi 1, 2, 3, 4, 5 , Pengyang Wang 1, 2, 3, 4, 5 , Renjie Li 1, 2, 3, 4, 5 , Biao Shi 1, 2, 3, 4, 5 , Qixing Zhang 1, 2, 3, 4, 5 , Qian Huang 1, 2, 3, 4, 5 , Shengzhi Xu 1, 2, 3, 4, 5 , Ying Zhao 1, 2, 3, 4, 5 , Xiaodan Zhang 1, 2, 3, 4, 5
Affiliation
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Inorganic perovskite solar cells (IPSCs) have developed rapidly due to their good thermal stability and the bandgap suitable for perovskite/silicon tandem solar cells. However, the large open-circuit voltage (VOC) deficit derived from the surface defects and the energy level structure mismatch impede the development of device performance, especially in the P-I-N structure IPSCs. Herein, an innovative in situ etching (ISE) treatment method is proposed to reduce surface defects through methanol without additional passivator. It is found that the perovskite films treated with methanol result in a slight excess of PbI2 on the surface and inserted into the grain boundaries. Therefore, the successful decrease of surface defects by methanol and the passivation of grain boundary defects by PbI2 greatly reduce the trap density of perovskite films. And the larger work function of PbI2 contributes to the energy band of perovskite surface bending downward and forms gradient energy level alignment at the I/N interface, which accelerates extraction of charge carriers. As a result, the efficiency of CsPbI2.85Br0.15 inverted IPSC is enhanced from 16.00% to 19.34%, which is one of the mostly efficient IPSCs. This work provides an original idea without additional passivator to manage the defects of inorganic perovskite.
中文翻译:
高效倒置无机钙钛矿太阳能电池的甲醇原位蚀刻表面缺陷管理
无机钙钛矿太阳能电池(IPSCs)由于其良好的热稳定性和适用于钙钛矿/硅串联太阳能电池的带隙而得到迅速发展。然而,由表面缺陷和能级结构失配引起的大开路电压(V OC )不足阻碍了器件性能的发展,特别是在PIN结构IPSC中。在此,提出了一种创新的原位蚀刻 (ISE) 处理方法,通过甲醇减少表面缺陷,无需额外的钝化剂。发现用甲醇处理的钙钛矿薄膜导致PbI 2略微过量在表面上并插入晶界。因此,甲醇成功减少表面缺陷和PbI 2钝化晶界缺陷大大降低了钙钛矿薄膜的陷阱密度。并且PbI 2较大的功函数有助于钙钛矿表面的能带向下弯曲并在I/N界面形成梯度能级排列,从而加速载流子的提取。因此,CsPbI 2.85 Br 0.15倒置 IPSC 的效率从 16.00% 提高到 19.34%,是最高效的 IPSC 之一。这项工作提供了一个原创的想法,无需额外的钝化剂来控制无机钙钛矿的缺陷。
更新日期:2023-03-15
中文翻译:
![](https://scdn.x-mol.com/jcss/images/paperTranslation.png)
高效倒置无机钙钛矿太阳能电池的甲醇原位蚀刻表面缺陷管理
无机钙钛矿太阳能电池(IPSCs)由于其良好的热稳定性和适用于钙钛矿/硅串联太阳能电池的带隙而得到迅速发展。然而,由表面缺陷和能级结构失配引起的大开路电压(V OC )不足阻碍了器件性能的发展,特别是在PIN结构IPSC中。在此,提出了一种创新的原位蚀刻 (ISE) 处理方法,通过甲醇减少表面缺陷,无需额外的钝化剂。发现用甲醇处理的钙钛矿薄膜导致PbI 2略微过量在表面上并插入晶界。因此,甲醇成功减少表面缺陷和PbI 2钝化晶界缺陷大大降低了钙钛矿薄膜的陷阱密度。并且PbI 2较大的功函数有助于钙钛矿表面的能带向下弯曲并在I/N界面形成梯度能级排列,从而加速载流子的提取。因此,CsPbI 2.85 Br 0.15倒置 IPSC 的效率从 16.00% 提高到 19.34%,是最高效的 IPSC 之一。这项工作提供了一个原创的想法,无需额外的钝化剂来控制无机钙钛矿的缺陷。