Dynamic characteristics of organic bulk-heterojunction solar cells |
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Authors: | S D Babenko A A Balakai Yu L Moskvin G V Simbirtseva P A Troshin |
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Affiliation: | 1.Institute of Problems of Chemical Physics,Russian Academy of Sciences,Chernogolovka, Moscow oblast,Russia |
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Abstract: | Transient characteristics of organic bulk-heterojunction solar cells have been studied using pulsed laser probing. An analysis
of the photoresponse waveforms of a typical solar cell measured by varying load resistance within broad range at different
values of the bias voltage provided detailed information on the photocell parameters that characterize electron-transport
properties of active layers. It is established that the charge carrier mobility is sufficient to ensure high values of the
fill factor (∼0.6) in the obtained photocells. On approaching the no-load voltage, the differential capacitance of the photocell
exhibits a sixfold increase as compared to the geometric capacitance. A possible mechanism of recombination losses in the
active medium is proposed. |
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