標題: New Helicene-Type Hole-Transporting Molecules for High-Performance and Durable Perovskite Solar Cells
作者: Lin, Yeo-Sin
Abate, Seid Yimer
Lai, Kuan-Wen
Chu, Chih-Wei
Lin, Yan-Duo
Tao, Yu-Tai
Sun, Shih-Sheng
應用化學系
Department of Applied Chemistry
關鍵字: perovskite solar cells;hole-transporting materials;helicene-type molecule;carbazole;azahelicenes
公開日期: 5-十二月-2018
摘要: Three azahelicene derivatives with electron-rich bis(4-methoxyphenyl)amino or bis(p-methoxyphenyl)aminophenyl groups at the terminals were deliberately designed, synthesized, and characterized as hole-transporting materials (HTMs) for perovskite solar cells (PSCs). Optical and thermal properties, energy level alignments, film morphologies, hole extraction ability, and hole mobility were studied in detail. PSCs using the newly synthesized molecules as HTMs were fabricated. A maximum power conversion efficiency (PCE) of 17.34% was observed for the bis(p-methoxyphenyl)amino-substituted derivative (SY1) and 16.10% for the bis(p-methoxyphenyeaminophenyl-substituted derivative (SY2). Longer-chain substituent such as hexyloxy group greatly diminishes the efficiency. In addition, the dopant-free devices fabricated with SY1 as the HTM shows an average PCE of 12.13%, which is significantly higher than that of spiro-OMeTAD (7.61%). The ambient long-term stability test revealed that after 500 h, the devices prepared from SY1 and SY2 retained more than 96% of its initial performance, which is much improved than the reference device with standard spiro-OMeTAD as the HTM under the same conditions. Detailed material cost analysis reveals that the material cost for SY1 is less than 8% of that for spiro-OMeTAD. These results provide a useful direction for designing a new class of HTMs to prepare highly efficient and more durable PSCs.
URI: http://dx.doi.org/10.1021/acsami.8b16601
http://hdl.handle.net/11536/148585
ISSN: 1944-8244
DOI: 10.1021/acsami.8b16601
期刊: ACS APPLIED MATERIALS & INTERFACES
Volume: 10
起始頁: 41439
結束頁: 41449
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