標題: Asymmetric Benzotrithiophene-Based Hole Transporting Materials Provide High-Efficiency Perovskite Solar Cells
作者: Budiawan, Widhya
Lai, Kuan-Wen
Karuppuswamy, Priyadharsini
Jadhav, Tushar Sanjay
Lu, Yen-An
Ho, Kuo-Chuan
Wang, Pen-Cheng
Chang, Chien-Chen
Chu, Chih-Wei
應用化學系
Department of Applied Chemistry
關鍵字: perovskite solar cell;hole transporting material;small molecules;asymmetric benzotrithiophenes;charge transport
公開日期: 1-七月-2020
摘要: In this study, we synthesized a series of small-molecule benzotrithiophenes (BTTs) and used them as hole transporting materials (HTMs) in perovskite solar cells (PSCs). The asymmetric benzo[2,1-b:-3,4-b':5,6-b"]trithiophene unit was used as the central core to which were appended various donor groups, namely, carbazole (BTT-CB), thieno thiophene (BTT-FT), triphenylamine (BTT-TPA), and bithiophene (BTT-TT). The extended aromatic core in the asymmetric BTT provided full planarity, thereby favoring intermolecular pi-stacking and charge transport. The physical, optical, and electrical properties of these small-molecule HTMs are reported herein. BTT-TT displayed good crystallinity and superior hole mobility, when compared with those of the other three HTMs, and formed smooth and uniform surfaces when covering the perovskite active layer. Accordingly, among the devices prepared in this study, a PSC incorporating BTT-TT as the HTM achieved the highest power conversion efficiency (18.58%). Moreover, this BTT-TT-containing device exhibited good stability after storage for more than 700 h. Thus, asymmetric BTTs are promising candidate materials for use as small-molecule HTMs in PSCs.
URI: http://dx.doi.org/10.1021/acsami.0c02204
http://hdl.handle.net/11536/154857
ISSN: 1944-8244
DOI: 10.1021/acsami.0c02204
期刊: ACS APPLIED MATERIALS & INTERFACES
Volume: 12
Issue: 26
起始頁: 29143
結束頁: 29152
顯示於類別:期刊論文