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D–A–A‐Type Organic Dyes for NiO‐Based Dye‐Sensitized Solar Cells
Author(s) -
Wu Fei,
Liu Jianlin,
Li Xi,
Song Qunliang,
Wang Min,
Zhong Cheng,
Zhu Linna
Publication year - 2015
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.201501036
Subject(s) - triphenylamine , chemistry , energy conversion efficiency , photocurrent , dielectric spectroscopy , dye sensitized solar cell , photochemistry , open circuit voltage , acceptor , electrolyte , electrochemistry , optoelectronics , voltage , electrode , materials science , physics , quantum mechanics , condensed matter physics
Three new D–A–A‐type organic sensitizers – W1, W2, and W3 – have been synthesized and applied for p‐type dye‐sensitized solar cells. For the first time, the electron‐withdrawing 2,1,3‐benzothiadiazole (BT) unit has been applied as the π‐bridge between the triphenylamine donor and different acceptors in these dye molecules. It turns out that these dyes all exhibit power conversion efficiencies exceeding 0.1 %, and that the best performance is achieved by the dye W2, with an octyl 2‐cyanoacrylate acceptor. It shows a power conversion efficiency of 0.166 %, with a short circuit current of 4.16 mA cm –2 and an open circuit voltage of 0.121 V. The higher light‐harvesting efficiency leads to a higher photocurrent in W2. In addition, electrochemical impedance spectroscopy (EIS) studies suggest slower charge recombination at the metal oxide/electrolyte interface and a faster hole‐transporting ability of W2. The factors together may account for the higher power conversion efficiency of W2. This work demonstrates rational design of these dye molecules for the construction of efficient p‐type sensitizers.