Zhang Hong, Eickemeyer Felix Thomas, Zhou Zhiwen, Mladenović Marko, Jahanbakhshi Farzaneh, Merten Lena, Hinderhofer Alexander, Hope Michael A, Ouellette Olivier, Mishra Aditya, Ahlawat Paramvir, Ren Dan, Su Tzu-Sen, Krishna Anurag, Wang Zaiwei, Dong Zhaowen, Guo Jinming, Zakeeruddin Shaik M, Schreiber Frank, Hagfeldt Anders, Emsley Lyndon, Rothlisberger Ursula, Milić Jovana V, Grätzel Michael
Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
Laboratory of Computational Chemistry and Biochemistry, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
Nat Commun. 2021 Jun 7;12(1):3383. doi: 10.1038/s41467-021-23566-2.
Formamidinium lead iodide perovskites are promising light-harvesting materials, yet stabilizing them under operating conditions without compromising optimal optoelectronic properties remains challenging. We report a multimodal host-guest complexation strategy to overcome this challenge using a crown ether, dibenzo-21-crown-7, which acts as a vehicle that assembles at the interface and delivers Cs ions into the interior while modulating the material. This provides a local gradient of doping at the nanoscale that assists in photoinduced charge separation while passivating surface and bulk defects, stabilizing the perovskite phase through a synergistic effect of the host, guest, and host-guest complex. The resulting solar cells show power conversion efficiencies exceeding 24% and enhanced operational stability, maintaining over 95% of their performance without encapsulation for 500 h under continuous operation. Moreover, the host contributes to binding lead ions, reducing their environmental impact. This supramolecular strategy illustrates the broad implications of host-guest chemistry in photovoltaics.
甲脒碘化铅钙钛矿是很有前景的光捕获材料，但在不损害最佳光电性能的情况下在工作条件下使其稳定仍然具有挑战性。我们报告了一种多模态主客体络合策略，以使用冠醚二苯并-21-冠-7来克服这一挑战，该冠醚充当在界面处组装并将铯离子输送到内部同时调节材料的载体。这在纳米尺度上提供了局部掺杂梯度，有助于光生电荷分离，同时钝化表面和体缺陷，通过主体、客体和主客体络合物的协同作用稳定钙钛矿相。由此产生的太阳能电池显示出超过24%的功率转换效率和增强的运行稳定性，在连续运行500小时且未封装的情况下保持超过95%的性能。此外，主体有助于结合铅离子，减少其对环境的影响。这种超分子策略说明了主客体化学在光伏领域的广泛意义。
