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Detailed analysis of ultrathin fluorescent red dye interlayer for organic photovoltaic cells

Yue Zang, Jun-Sheng Yu, Na-Na Wang, Ya-Dong Jiang
2011 Chinese Physics B  
The influence of an ultrathin 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) fluorescent dye layer at donor/acceptor heterojunction on the performance of small-molecule organic photovoltaic (OPV) cell is studied. The structure of OPV cell is of indium-tin oxide (ITO)/copper phthalocyanine (CuPc)/DCJTB/fullerene (C 60 )/bathophenanthroline (Bphen)/Ag. The results show that open circuit voltage (V OC ) increases to 0.57 V as the film thickness of DCJTB
more » ... ckness of DCJTB layer increases from 0.2 to 2.0 nm. By using an equivalent circuit model, the enhancement of V OC is found to be attributed to the reduced reverse saturation current density (J S ) which is due to the lower highest occupied molecular orbital (HOMO) level in DCJTB than that in CuPc. Also, the short circuit current density (J SC ) is affected when the DCJTB layer becomes thicker, resulting from the high series resistance R S A due to the low charge carrier mobility of fluorescent red dye.
doi:10.1088/1674-1056/20/1/017202 fatcat:dbmvxpgmnbggjhkcdqsidhcvmi