中国物理B ›› 2011, Vol. 20 ›› Issue (1): 17202-017202.doi: 10.1088/1674-1056/20/1/017202

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

臧月, 于军胜, 王娜娜, 蒋亚东   

  1. 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
  • 收稿日期:2010-07-28 修回日期:2010-08-24 出版日期:2011-01-15 发布日期:2011-01-15
  • 基金资助:
    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).

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

Zang Yue(臧月),Yu Jun-Sheng(于军胜)†, Wang Na-Na(王娜娜),and Jiang Ya-Dong(蒋亚东)   

  1. 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
  • Received:2010-07-28 Revised:2010-08-24 Online:2011-01-15 Published:2011-01-15
  • Supported by:
    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).

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摘要： 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.

关键词: organic photovoltaic (OPV) cells, DCJTB, interlayer thickness, ultrathin red dye

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.

Key words: organic photovoltaic (OPV) cells, DCJTB, interlayer thickness, ultrathin red dye

中图分类号:  (Photoconduction and photovoltaic effects)

  • 72.40.+w
73.40.Lq (Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions) 79.60.Jv (Interfaces; heterostructures; nanostructures)