標題: Molecular Engineering of Organic Dyes with a Hole-Extending Donor Tail for Efficient All-Solid-State Dye-Sensitized Solar Cells
作者: Lu, Jianfeng
Chang, Yu-Cheng
Cheng, Hsu-Yang
Wu, Hui-Ping
Cheng, Yibing
Wang, Mingkui
Diau, Eric Wei-Guang
應用化學系
應用化學系分子科學碩博班
Department of Applied Chemistry
Institute of Molecular science
關鍵字: donor-acceptor systems;dyes;porphyrinoids;sensitizers;solar cells
公開日期: 1-一月-2015
摘要: We report a new concept for the design of metal-free organic dyes (OD5-OD9) with an extended donor-pi-acceptor (D-pi-A) molecular framework, in which the donor terminal unit is attached by a hole-extending side chain to retard back electron transfer and charge recombination; the pi-bridge component contains varied thiophene-based substituents to enhance the light-harvesting ability of the device. The best dye (OD9) has a D-A-pi-A configuration with the hexyloxyphenylthiophene (HPT) side chain as a hole-extension component and a benzothiadiazole (BTD) internal acceptor as a pi-extension component. The co-sensitization of OD9 with the new porphyrin dye LW24 enhanced the light-harvesting ability to 800 nm; thus, a power conversion efficiency 5.5% was achieved. Photoinduced absorption (PIA) and transient absorption spectral (TAS) techniques were applied to account for the observed trend of the open-circuit voltage (V-OC) of the devices. This work provides insights into the molecular design, photovoltaic performance, and kinetics of charge recombination.
URI: http://dx.doi.org/10.1002/cssc.201500309
http://hdl.handle.net/11536/128190
ISSN: 1864-5631
DOI: 10.1002/cssc.201500309
期刊: CHEMSUSCHEM
Issue: 15
起始頁: 2529
結束頁: 2536
顯示於類別:期刊論文