期刊
JOURNAL OF POWER SOURCES
卷 234, 期 -, 页码 139-146出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.01.152
关键词
Solar cells; Indoline; Rhodanine; Acceptor; Charge recombination
资金
- National Natural Science Foundation of China [21102034, 21176075]
- Science Foundation for the Excellent Youth Scholars of Hebei Province [Y2012017]
- Nature Science Foundation of Hebei Province [B2012205001, 23245036]
- National 973 Program [2013CB733700]
- Oriental Scholarship
- Fundamental Research Funds for the Central Universities [WK1013002]
- Open Funding Project of State Key Laboratory of Luminescent Materials and Devices (SCUT)
- Grants-in-Aid for Scientific Research [23245035] Funding Source: KAKEN
For developing panchromatic dyes, we focus on the effect of rhodanine acceptor on photovoltaic performances in D-pi-A indoline dye. Upon changing from cyanoacetic acid (dye C-CA) to rhodanine-3-acetic acid (dye C-RA) as acceptor and anchoring group, C-RA shows broader absorption band, which can overlap with the solar spectrum more preferably. However, the power conversion efficiency of DSSCs based on C-RA (0.57-0.90%) is one order of magnitude with respect to C-CA (8.49%). The distinct difference of IPCE values between C-CA and C-RA is predominately attributed to the different excited electron injection yield (Phi(inj)). The relatively short excited electron lifetime and the isolation of LUMO orbital from anchoring group in C-RA result in the low photo-excited electron injection efficiency with low J(SC). Moreover, with respect to C-CA, the systematic SLIT and EIS studies demonstrate that C-RA possesses the relatively low injection charge density in the TiO2 electrode and fast charge recombination rate, leading to a low V-OC. Our studies are highly helpful to the design of novel metal-free D-pi-A organic sensitizers, especially for those using rhodanine-3-acetic acid as acceptor. (c) 2013 Elsevier B.V. All rights reserved.
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