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李美成教授课题组在钙钛矿太阳电池性能提升领域取得重要进展
信息发布于:2024-05-13
钙钛矿太阳电池效率高、成本低,极具发展潜力,已成为太阳能开发利用技术的研究热点。当前,钙钛矿太阳电池的效率距肖克利-奎瑟尔理论极限还有差距,电池内部界面处的载流子复合损失是限制性能进一步提高的关键因素。钙钛矿上界面的后处理已成为制备高效钙钛矿太阳电池不可或缺的环节,然而与上界面相比,埋底界面对电池性能影响更为关键,将直接影响钙钛矿结晶和界面电荷传输。针对埋底界面问题,分子桥策略是一种能优化异质界面能级与结构,进而提升电池性能的有效方式。因此,亟需探明构建分子桥的分子设计机制与定向排列规律,匹配分子官能团、分子构型和分子尺寸等特性,实现钙钛矿结晶缺陷抑制与界面能级匹配的协同调控。
李美成教授课题组针对埋底界面载流子复合制约钙钛矿太阳电池性能提升的技术瓶颈,深入分析了界面缺陷与能级失配对载流子传输的影响机制,突破了界面缺陷钝化、载流子抽取增强以及钙钛矿薄膜拉伸应力的释放等多项关键技术,采用4-氯-3-磺胺基苯甲酸在埋藏界面上成功构建了分子桥,并通过COOH-Ti定向吸附在TiO2电子传输层表面,然后通过S=O-Pb与钙钛矿层连接,形成可行的定向分子桥。相应优化后的钙钛矿太阳电池获得了25.32%的认证效率,在环境条件下老化3000小时和紫外辐照1200小时后,未封装的电池分别保持了91%和85%的初始效率。本成果提出了埋底界面的定向分子桥优化策略,阐明了分子优先排列机制,为实现钙钛矿太阳电池效率和稳定性的进一步提升提供了理论与技术参考。
▲图a 埋底界面分子桥策略示意图,图b 钙钛矿太阳电池认证效率
2024年2月起,该研究工作的系列成果“Oriented Molecular Bridge Constructs Homogeneous Buried Interface for Perovskite Solar Cells with Efficiency Over 25.3%”等连续发表在国际顶级一区SCI期刊Advanced Materials、Advanced Energy Materials、ACS Energy Letters、Angewandte Chemie、Advanced Functional Materials、Small上,其中以25.74%的效率刷新潮湿空气中制备的钙钛矿太阳电池效率记录[2],以25.76%的效率刷新平面二氧化钛基钙钛矿太阳电池效率记录[4],论文的第一通讯作者是918博天堂系统全国重点实验室李美成教授,918博天堂系统全国重点实验室是论文第一通讯单位。
该研究工作得到了国家自然科学基金重点项目和青年项目、国家重点研发计划课题等项目资助。
Reference:[1] X. Wang, H. Huang, M. Wang, Z. Lan and P. Cui, "Oriented Molecular Bridge Constructs Homogeneous Buried Interface for Perovskite Solar Cells with Efficiency Over 25.3%," in Advanced Materials, vol. 36, no. 16, pp. 2310710, Feb. 2024 (IF: 29.4)
[2] Y. Yang, H. Huang, L. Yan, P. Cui and Z. Lan, "Compatible Soft-Templated Deposition and Surface Molecular Bridge Construction of SnO2 Enable Air-Fabricated Perovskite Solar Cells with Efficiency Exceeding 25.7%," in Advanced Energy Materials, http://doi.org/10.1002/aenm.202400416, Mar. 2024 (IF: 27.8)
[3] X. Zhao, Y. Qiu, M. Wang, D. Wu and X. Yue, "Regulation of Buried Interface through the Rapid Removal of PbI2·DMSO Complex for Enhancing Light Stability of Perovskite Solar Cells," in ACS Energy Letters, http://doi.org/10.1021/acsenergylett.4c00386 (IF: 22)
[4] Z. Lan, H. Huang, S. Du, Y. Lu and C. Sun, "Cascade Reaction in Organic Hole Transport Layer Enables Efficient Perovskite Solar Cells," in Angewandte Chemie, http://doi.org/10.1002/ange.202402840, Mar. 2024 (IF: 16.6)
[5] Z. Lan, H. Huang, S. Du, Y. Lu and C. Sun, " Homogenizing the Electron Extraction via Eliminating Low-conductive Contacts Enables Efficient Perovskite Solar Cells with Reduced Up-scaling Losses," in Advanced Functional Materials, http://doi.org/10.1002/adfm.202316591 (IF: 19)
[6] X. Wang, H. Huang, M. Wang, Z. Lan and Y. Yang, "Minimizing Voltage Losses via Synergistically Reducing Hetero-Interface Energy Offset for High Efficiency Perovskite Solar Cells," in Small, http://doi.org/10.1002/smll.202312067 (IF: 13.3)
初审:崔鹏
复审:李美成
编辑:张洪
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