Interfacial engineering has proven to be extremely important for colloidal quantum dot (QD) solar cells. However, in comparison with the QD surface and device top interface, the buried interface has received much less attention. Herein, we report an efficient strategy of utilizing a cyclic passivator (CyP), namely, acesulfame potassium, to modulate a titanium oxide (TiO₂)/CsPbI₃ QD buried interface. The isotropic CyP can effectively passivate defects at the TiO₂ and CsPbI₃ QD surface through target chemical binding and, hence, facilitate interfacial charge extraction and transport. Substantially, the CyP-engineered buried interface delivers a high power conversion efficiency (PCE) of 17.50% for all-inorganic CsPbI₃ perovskite QD solar cells. More importantly, we first report the refurbishment of high-efficiency QD solar cells, and CyP-buried modulation can assist in the recycling of high-cost TiO₂/F-doped tin oxide electrodes. The PCE of the CyP-engineered refurbished CsPbI₃ QD device remains over 90% of the corresponding fresh one after up to the 4th round of recycling of retired devices. These findings reveal the importance and potential of the buried interface that will propel both the performance and sustainable development of QD-based optoelectronic devices.

中文翻译：

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埋地界面工程可实现高效和翻新的 CsPbI3 钙钛矿量子点太阳能电池


界面工程已被证明对于胶体量子点 （QD） 太阳能电池极为重要。然而，与 QD 表面和器件顶部接口相比，埋入式接口受到的关注要少得多。在此，我们报道了一种利用循环钝化剂 （CyP），即安赛蜜）调节氧化钛 （TiO₂）/CsPbI₃ QD 埋入界面的有效策略。各向同性的 CyP 可以通过靶材化学结合有效地钝化 TiO₂ 和 CsPbI₃ QD 表面的缺陷，从而促进界面电荷的提取和传输。从本质上讲，CyP 设计的埋地界面为全无机 CsPbI₃ 钙钛矿 QD 太阳能电池提供了 17.50% 的高功率转换效率 （PCE）。更重要的是，我们首先报道了高效 QD 太阳能电池的翻新，CyP 埋设调制可以帮助回收高成本的 TiO₂/F 掺杂氧化锡电极。在对退役设备进行第 4 轮回收后，CyP 设计的翻新 CsPbI₃ QD 设备的 PCE 仍保持为相应新鲜设备的 90% 以上。这些发现揭示了埋入式界面的重要性和潜力，这将推动基于 QD 的光电器件的性能和可持续发展。