PMID- 25224656
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20150521
LR  - 20141124
IS  - 1861-471X (Electronic)
IS  - 1861-471X (Linking)
VI  - 9
IP  - 12
DP  - 2014 Dec
TI  - Influence of the auxiliary acceptor on the absorption response and photovoltaic 
      performance of dye-sensitized solar cells.
PG  - 3549-57
LID - 10.1002/asia.201402608 [doi]
AB  - Three new dyes with a 2-(1,1-dicyanomethylene)rhodanine (IDR-I, -II, -III) 
      electron acceptor as anchor were synthesized and applied to dye-sensitized solar 
      cells. We varied the bridging molecule to fine tune the electronic and optical 
      properties of the dyes. It was demonstrated that incorporation of auxiliary 
      acceptors effectively increased the molar extinction coefficient and extended the 
      absorption spectra to the near-infrared (NIR) region. Introduction of 
      2,1,3-benzothiadiazole (BTD) improved the performance by nearly 50 %. The best 
      performance of the dye-sensitized solar cells (DSSCs) based on IDR-II reached 
      8.53 % (short-circuit current density (Jsc)=16.73 mA cm(-2), open-circuit voltage 
      (Voc)=0.71 V, fill factor (FF)=71.26 %) at AM 1.5 simulated sunlight. However, 
      substitution of BTD with a group that featured the more strongly 
      electron-withdrawing thiadiazolo[3,4-c]pyridine (PT) had a negative effect on the 
      photovoltaic performance, in which IDR-III-based DSSCs showed the lowest 
      efficiency of 4.02 %. We speculate that the stronger auxiliary acceptor acts as 
      an electron trap, which might result in fast combination or hamper the electron 
      transfer from donor to acceptor. This inference was confirmed by electrical 
      impedance analysis and theoretical computations. Theoretical analysis indicates 
      that the LUMO of IDR-III is mainly localized at the central acceptor group owing 
      to its strong electron-withdrawing character, which might in turn trap the 
      electron or hamper the electron transfer from donor to acceptor, thereby finally 
      decreasing the efficiency of electron injection into a TiO2 semiconductor. This 
      result inspired us to select moderated auxiliary acceptors to improve the 
      performance in our further study.
CI  - (c) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
FAU - Wu, ZhiFang
AU  - Wu Z
AD  - Key Laboratory for Advanced Materials, Institute of Fine Chemicals, East China 
      University of Science and Technology, Shanghai 200237 (China), Fax: 
      (+86) -264252756.
FAU - Li, Xin
AU  - Li X
FAU - Li, Jing
AU  - Li J
FAU - Hua, JianLi
AU  - Hua J
FAU - Agren, Hans
AU  - Agren H
FAU - Tian, He
AU  - Tian H
LA  - eng
PT  - Journal Article
DEP - 20140915
PL  - Germany
TA  - Chem Asian J
JT  - Chemistry, an Asian journal
JID - 101294643
OTO - NOTNLM
OT  - charge transfer
OT  - donor-acceptor systems
OT  - dyes/pigments
OT  - electron trap
OT  - sensitizers
EDAT- 2014/09/17 06:00
MHDA- 2014/09/17 06:01
CRDT- 2014/09/17 06:00
PHST- 2014/06/04 00:00 [received]
PHST- 2014/07/03 00:00 [revised]
PHST- 2014/09/17 06:00 [entrez]
PHST- 2014/09/17 06:00 [pubmed]
PHST- 2014/09/17 06:01 [medline]
AID - 10.1002/asia.201402608 [doi]
PST - ppublish
SO  - Chem Asian J. 2014 Dec;9(12):3549-57. doi: 10.1002/asia.201402608. Epub 2014 Sep 
      15.