Abstract
Transient photovoltage of ITO/organic/Al cells is studied under different bias polarities and voltages. It is found that for an ITO/NPB/Al cell, light incidence on the Al side induces more bias-dependent transient photovoltage variation when the photovoltage is positive than when it is negative. However, for an ITO/C60/Al cell, the variation characteristics of transient photovoltage is reversed. These results support the previously proposed mechanism that Al could inject charges into the organic layer upon photon excitation, indicating that the absorption of electrode can also contribute to photovoltaic effect.
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References
Pope M, Swenberg C E. Electronic processes in organic solids. Annu Rev Phys Chem, 1984, 35: 613–655
Tang C W. Two-layer organic photovoltaic cell. Appl Phys Lett, 1986, 48: 183–185
Hoppe H, Sariciftci N S. Organic solar cells: An overview. J Mater Res, 2004, 19: 1924–1945
Spanggaard H, Krebs F C. A brief history of the development of organic and polymeric photovoltaics. Solar Energy Mater Solar Cells, 2004, 83: 125–146
Xue J, Rand B P, Uchida S, et al. A hybrid planar-mixed molecular heterojunction photovoltaic cell. Adv Mater, 2005, 17: 66–71
Mutolo K L, Mayo E I, Rand B P, et al. Enhanced open-circuit voltage in subphthalocyanine/C60 organic photovoltaic cells. J Am Chem Soc, 2006, 128: 8108–8109
Yu B, Huang L, Wang H, et al. Efficient organic solar cells using a high-quality crystalline thin film as a donor layer. Adv Mater, 2010, 22: 1017–1020
Wang M L, Song Q L, Wu H R, et al. Small-molecular organic solar cells with C60/Al composite anode. Org Electron, 2007, 8: 445–449
Chan M Y, Lai S L, Fung M K, et al. Doping-induced efficiency enhancement in organic photovoltaic devices. Appl Phys Lett, 2007, 90: 023504
Ameri T, Dennler T, Lungenschmied C, et al. Organic tandem solar cells: A review. Energy Environ Sci, 2009, 2: 347–363
Rand B P, Peumans P, Forrest S R. Long-range absorption enhancement in organic tandem thin-film solar cells containing silver nanoclusters. J Appl Phys, 2004, 96: 7519–7526
O’Connor B, An K H, Pipe K P, et al. Enhanced optical field intensity distribution in organic photovoltaic devices using external coatings. Appl Phys Lett, 2006, 89: 233502
Wu B, Sun X Y, Sun Z Y, et al. Large enhancement of transient photovoltage induced by the absorption of the metal Al. Sci China-Phys Mech Astron, 2012, 55: 1240–1244
Zhang Z L, Jiang X Y, Zhu W Q, et al. A white organic light emitting diode with improved stability. J Phys D-Appl Phys, 2001, 34: 3083–3087
Park I S, Park S R, Shin D Y, et al. Modeling and simulation of electronic and excitonic emission properties in organic host-guest systems. Org Electron, 2010, 11: 218–226
Peumans P, Forrest S R. Very-high-efficiency double-heterostructure copper phthalocyanine/C60 photovoltaic cells. Appl Phys Lett, 2001, 79: 126
Brabec C J, Cravino A, Meissner D, et al. Origin of the open circuit voltage of plastic solar cells. Adv Funct Mater, 2001, 11: 374–380
Braun B, Salaneck W R, Fahlman M. Energy-level alignment at organic/metal and organic/organic interfaces. Adv Mater, 2009, 21: 1450–1472
Priebe G, Pietzak B, Konenkamp R. Determination of transport parameters in fullerene films. Appl Phys Lett, 1997, 71: 2160–2162
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Wu, B., Li, W., Yu, H. et al. Photoinduced charge injection in the metal/organic interface studied by transient photovoltage measurements with bias. Sci. China Phys. Mech. Astron. 56, 2012–2015 (2013). https://doi.org/10.1007/s11433-013-5246-7
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DOI: https://doi.org/10.1007/s11433-013-5246-7