Macromers for Encapsulating Perovskite Photovoltaics and Achieving High Stability
Xiaohua Tang1, Tianjiao Zhang1, Weijie Chen1, Haiyang Chen1*(陈海阳), Zhichao Zhang1, Xining Chen1, Hao Gu1, Shuaiqing Kang1, Chuanshuai Han1, Tingting Xu1, Jianlei Cao1, Jialei Zheng1, Xuemei Ou, Yaowen Li1,2,3*(李耀文), Yongfang Li1,2,4
1Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
2Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou 215123,China
3State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials,Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application College of Chemistry Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
4Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences, Beijing 100190, China
Adv. Mater. 2024, 36, 2400218
Abstract: Perovskite solar cells (pero-SCs) are highly unstable even under trace water. Although the blanket encapsulation (BE) strategy applied in the industry can effectively block moisture invasion, the commercial UV-curable adhesives (UVCAs) for BE still trigger power conversion efficiency deterioration, and the degradation mechanism remains unknown. For the first time, the functions of commercial UVCAs are revealed in BE-processed pero-SCs, where the small-sized monomer easily permeates to the perovskite surface, forming an insulating barrier to block charge extraction, while the high-polarity moiety can destroy perovskite lattice. To solve these problems, a macromer, named PIBA is carefully designed, by grafting two acrylate terminal groups on the highly gastight polyisobutylene and realizes an increased molecular diameter as well as avoided high-polarity groups. The PIBA macromer can stabilize on pero-SCs and then sufficiently crosslink, forming a compact and stable network under UV light without sacrificing device performance during the BE process. The resultant BE devices show negligible efficiency loss after storage at 85% relative humidity for 2000 h. More importantly, these devices can even reach ISO 20653:2013 Degrees of protection IPX7 standard when immersed in one-meter-deep water. This BE strategy shows good universality in enhancing the moisture stability of pero-SCs, irrespective of the perovskite composition or device structure.
链接：//onlinelibrary.wiley.com/doi/10.1002/adma.202400218
