| Title: |
Multimodal host–guest complexation for efficient and stable perovskite photovoltaics. |
| Authors: |
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 |
| Source: |
Nature Communications; 6/7/2021, Vol. 12 Issue 1, p1-11, 11p |
| Subject Terms: |
PHOTOVOLTAIC power generation, METHYLAMMONIUM, PEROVSKITE, HOST-guest chemistry, SOLAR cells, CROWN ethers, CUCURBITURIL |
| Abstract: |
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. It remains a challenge to achieve a balance between performance and stability, as well as addressing the environmental impact of perovskite solar cells. Here, the authors propose a multimodal host-guest complexation strategy enabling these shortcomings to be addressed simultaneously. [ABSTRACT FROM AUTHOR] |
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| Database: |
Complementary Index |
