Ion-modulated radical doping of spiro-OMeTAD for more efficient and stable perovskite solar cells

0559619 - ÚMCH 2023 RIV US eng J - Journal Article
Zhang, T. - Wang, F. - Kim, H.-B. - Choi, I.-W. - Wang, C. - Cho, E. - Konefal, Rafal - Puttisong, Y. - Terado, K. - Kobera, Libor - Chen, M. - Yang, M. - Bai, S. - Yang, B. - Suo, J. - Yang, S.-C. - Liu, X. - Fu, F. - Yoshida, H. - Chen, W. M. - Brus, Jiří - Coropceanu, V. - Hagfeldt, A. - Brédas, J.-L. - Fahlman, M. - Kim, D. S. - Hu, Z. - Gao, F.
Ion-modulated radical doping of spiro-OMeTAD for more efficient and stable perovskite solar cells.
Science. Roč. 377, č. 6605 (2022), s. 495-501. ISSN 0036-8075. E-ISSN 1095-9203
Institutional support: RVO:61389013
Keywords : doping of spiro-OMeTAD * robust perovskite solar cells * organic semiconductors doping
OECD category: Polymer science
Impact factor: 56.9, year: 2022
Method of publishing: Limited access
https://www.science.org/doi/10.1126/science.abo2757

Record power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) have been obtained with the organic hole transporter 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine)9,9′-spirobifluorene (spiro-OMeTAD). Conventional doping of spiro-OMeTAD with hygroscopic lithium salts and volatile 4-tert-butylpyridine is a time-consuming process and also leads to poor device stability. We developed a new doping strategy for spiro-OMeTAD that avoids post-oxidation by using stable organic radicals as the dopant and ionic salts as the doping modulator (referred to as ion-modulated radical doping). We achieved PCEs of >25% and much-improved device stability under harsh conditions. The radicals provide hole polarons that instantly increase the conductivity and work function (WF), and ionic salts further modulate the WF by affecting the energetics of the hole polarons. This organic semiconductor doping strategy, which decouples conductivity and WF tunability, could inspire further optimization in other optoelectronic devices.
Permanent Link: https://hdl.handle.net/11104/0333072