While the effect of interfacial morphology on the short circuit current () of organic photovoltaic devices (OPVs) is well known, its impact on open circuit voltage ( and fill-factor (FF) are less clear. Since the output power of a solar cell , such understanding is critical for designing high-performance, morphology-engineered OPVs. In this letter, we provide an explicit analytical proof that any effort to radically improve by tailoring bulk heterojunction morphology is futile, because any increase in due to larger interface area is counterbalanced by corresponding increase in recombination current, so that the upper limit of cannot exceed that of the corresponding planar heterojunction devices, i.e., . We discuss the implication of this -constraint on the efficiency optimization of organic solar cells.
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2 January 2012
Research Article|
January 05 2012
Can morphology tailoring improve the open circuit voltage of organic solar cells?
Biswajit Ray;
Biswajit Ray
a)
1
School of Electrical and Computer Engineering, Purdue University
, West Lafayette, Indiana 47906, USA
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Mark S. Lundstrom;
Mark S. Lundstrom
1
School of Electrical and Computer Engineering, Purdue University
, West Lafayette, Indiana 47906, USA
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Muhammad A. Alam
Muhammad A. Alam
b)
1
School of Electrical and Computer Engineering, Purdue University
, West Lafayette, Indiana 47906, USA
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a)
Electronic mail: [email protected].
b)
Electronic mail: [email protected].
Appl. Phys. Lett. 100, 013307 (2012)
Article history
Received:
June 07 2011
Accepted:
November 22 2011
Citation
Biswajit Ray, Mark S. Lundstrom, Muhammad A. Alam; Can morphology tailoring improve the open circuit voltage of organic solar cells?. Appl. Phys. Lett. 2 January 2012; 100 (1): 013307. https://doi.org/10.1063/1.3672221
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