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Chin. Phys. B, 2011, Vol. 20(1): 017202    DOI: 10.1088/1674-1056/20/1/017202

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

Zang Yue, Yu Jun-Sheng, Wang Na-Na, Jiang Ya-Dong
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China
Abstract  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 (C60)/bathophenanthroline (Bphen)/Ag. The results show that open circuit voltage (VOC) increases to 0.57 V as the film thickness of DCJTB layer increases from 0.2 to 2.0 nm. By using an equivalent circuit model, the enhancement of VOC is found to be attributed to the reduced reverse saturation current density (JS) which is due to the lower highest occupied molecular orbital (HOMO) level in DCJTB than that in CuPc. Also, the short circuit current density (JSC) is affected when the DCJTB layer becomes thicker, resulting from the high series resistance RSA due to the low charge carrier mobility of fluorescent red dye.
Keywords:  interlayer thickness      ultrathin red dye      organic photovoltaic (OPV) cells      DCJTB  
Received:  28 July 2010      Revised:  24 August 2010      Accepted manuscript online: 
PACS:  72.40.+w (Photoconduction and photovoltaic effects)  
  73.40.Lq (Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)  
  79.60.Jv (Interfaces; heterostructures; nanostructures)  
Fund: Project partially supported by the National Natural Science Foundation of China (NNSFC) (Grant Nos. 60736005 and 60425101-1), the Foundation for Innovative Research Groups of the NNSFC (Grant No. 60721001), the Research Fund for the Dectoral Program of Higher Education (RFDP) (Grant No. 20090185110020), the Program for New Century Excellent Talents in University, China (Grant No. NCET-06-0812), the Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry (Grant No. GGRYJJ08-05), and the Young Excellence Project of Sichuan Province, China (Grant No. 09ZQ026-074).

Cite this article: 

Zang Yue, Yu Jun-Sheng, Wang Na-Na, Jiang Ya-Dong Detailed analysis of ultrathin fluorescent red dye interlayer for organic photovoltaic cells 2011 Chin. Phys. B 20 017202

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