Unravel Energetic Disorders in Organic Bulk Hetero
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Posted On: 02/16/2017 1:36:33 PM
Unravel Energetic Disorders in Organic Bulk Heterojunction Photovoltaics using Capacitance-Voltage Spectroscopy
Xixiang Zhu, Kai Wang, Changfeng Han, Qin Yang, Xiaojuan Sun, Haomiao Yu, Ming Shao, Fujun Zhang, Bin Hu
(Submitted on 15 Feb 2017)
Organic semiconductors possess an intrinsic energetic disorder characteristic, which holds an exceptionally important role for understanding organic photovoltaic (OPV) operations and future optimizations. We performed illumination intensity dependence of capacitance-voltage (C-V) measurements in PIDTDTQx
C70BM based organic bulk heterojunction (BHJ) photovoltaic systems in working conditions. Energetic disorder profiles for the active layer, PIDTDTQx C70BM, changed significantly when different interfaces were involved. Effects of energetic disorder that could be reflected from the C-V profiles were incorporated through an exponential or Gaussian model of density of states (DOS), or a combination of these two. Results underlie an identical organic blend in solar cells exhibit different energetic disorders when it interacts with various interfaces. It may, thus, has a certain impact on OPV performances, such as open-circuit voltage (Voc ). Our study provides device physicists a different perspective view for tailoring the organic energetic disorder parameter via interfaces in order to enhance photo-electron conversion efficiencies (PCE).
https://arxiv.org/abs/1702.04484
Xixiang Zhu, Kai Wang, Changfeng Han, Qin Yang, Xiaojuan Sun, Haomiao Yu, Ming Shao, Fujun Zhang, Bin Hu
(Submitted on 15 Feb 2017)
Organic semiconductors possess an intrinsic energetic disorder characteristic, which holds an exceptionally important role for understanding organic photovoltaic (OPV) operations and future optimizations. We performed illumination intensity dependence of capacitance-voltage (C-V) measurements in PIDTDTQx
C70BM based organic bulk heterojunction (BHJ) photovoltaic systems in working conditions. Energetic disorder profiles for the active layer, PIDTDTQx C70BM, changed significantly when different interfaces were involved. Effects of energetic disorder that could be reflected from the C-V profiles were incorporated through an exponential or Gaussian model of density of states (DOS), or a combination of these two. Results underlie an identical organic blend in solar cells exhibit different energetic disorders when it interacts with various interfaces. It may, thus, has a certain impact on OPV performances, such as open-circuit voltage (Voc ). Our study provides device physicists a different perspective view for tailoring the organic energetic disorder parameter via interfaces in order to enhance photo-electron conversion efficiencies (PCE). https://arxiv.org/abs/1702.04484
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