期刊
ELECTROCHIMICA ACTA
卷 330, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135250
关键词
polythiophene solar cells; In-situ doping; Ex-situ doping; Charge transfer
资金
- Center for Research Excellence in Science and Technology program at California State University, Los Angeles (NSF) [HRD-1547723]
- Nature Science Foundation of China [21802051]
- 2011 Collaborative Innovative Grant of Hunan Province of China
- Natural Science Foundation of Shandong Province of China [ZR2019QB007]
- Shandong Provincial Program of Talent-Leading Teams
Solar cells constructed with well-ordered polythiophene (PT) or other pi-conjugated polymer films are known to yield better photovoltaic characteristics. We recently constructed a PT-based solar cell (PTSC) wherein the photoactive PT film was grown photoelectrochemically along a dye anchor, 3-{5-[N,N-bis(4-diphenylamino)phenyl]thieno[3,2-b]thiophen-2-yl}-2-cyano-acrylic acid (C207) pre-adsorbed onto a compact TiO2 layer. In an effort to understand the effects of other important factors contributing to the PTSC performance, we compared ex-situ and in-situ doping of ordered PT films with three different alkylammonium cations, tetrabutylammonium (TBA(+)), tetraethylammonium (TEA(+)), and tetramethylammonium (TMA(+)). The PT films that have undergone such ex- and in-situ doping both show higher open-circuit voltage (V-oc) and short-circuit current density (J(sc)) than their pristine counterparts. The optimal conversion efficiency (eta) of 7.53 +/- 0.58% was achieved via in-situ PT doping with TMA(+). The incident photon-to-electron conversion efficiency (IPCE), electrochemical impedance, and electron lifetime measurements all indicate that in-situ doping is less affected by the cation size and can lead to a higher doping level than the ex-situ doping method. The IPCE also benefits from the use of a thin TiO2 layer, as more light reaches the PT film to generate photohole/electron pairs. With the combined use of a thin layer of TiO2 and an ordered PT film containing a large number of dopant ions, the photohole/electron recombination is significantly suppressed. (C) 2019 Elsevier Ltd. All rights reserved.
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