Chemical doping engineering by utilizing trilacunary Keggin polyoxometalates as a dopant for high performance perovskite solar cells. Issue 1 (10th December 2020)

• Record Type: Journal Article
• Authors: Fan, Xiao; Zhang, Jian; Yang, Yulin; Xia, Debin; Dong, Yayu; Qiu, Lele; Wang, JiaQi; Cao, Wei; Hu, Boyuan; Wang, Wei; Fan, Ruiqing
• Is Part Of: Dalton transactions. Volume 50:Issue 1(2020)
• Page Start: 279
• Page End: 286
• Publication Date: 2020-12-10
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d0dt03201h
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Trilacunary Keggin type BiW9 -Zn was first used as a cost-effective dopant for Spiro-OMeTAD and the PCE was enhanced to 19.56%. Abstract : Chemical doping engineering is an effective strategy to modify the hole transport layer (HTL) and achieve high-efficiency perovskite solar cells (PSCs). In this work, we synthesize an infrequent trilacunary Keggin type polyoxometalate Na10 [Zn2 (H2 O)6 (WO2 )2 (BiW9 O33 )2 ] (BiW9 -Zn) and apply it as an additive to enhance the hole mobility and electrical conductivity of Spiro-OMeTAD based HTLs. Thanks to the strong electron-accepting properties of polyoxometalate molecules, the as-synthesized BiW9 -Zn can directly oxidize Spiro-OMeTAD under an inert atmosphere and avoid the tedious long-term oxidation process. Therefore, the power conversion efficiency (PCE) of optimal PSCs with BiW9 -Zn doping is enhanced from 17.58% (without doping) to 19.56% with a significantly improved fill factor and open-circuit voltage. In addition, the assembly repeatability and long-term stability of PSCs are also improved. This work demonstrates the potential of using polyoxometalates (POMs) as low-cost, efficient and highly flexible chemical dopants for HTLs, and more importantly paves a new route to enhance the performance of PSCs.