Abstract
The Poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothia diazole-4,7-diyl-2,5-thiophenediyl]/[6,6]-phenyl C71 butyric acid methyl ester blend active layers were prepared by spray deposition method with different preparative conditions. The active layers were prepared with and without TiOxlayer in order to study the property changes. The absorption and surface morphology of the active layers were analyzed using UV-visible spectral and atomic force microscopic studies. The photovoltaic cells were fabricated using the spray-coated active layers with and without TiOxlayer. The results were compared with the cells fabricated using the conventional spin-coated active layers.
Highlights
Organic solar cells (OSCs) are the best alternate for inorganic solar cells because of their low cost roll-to-roll production, and large area processability on exible substrates. erefore, organic solar cell (OSC) devices are of increasing interest as new materials for future light-activated energy sources
We report the bulk heterojunction solar cell devices fabricated using the spray-deposited active layers of polymer blend materials of poly[N-9′′-hepta-decanyl-2,7-carbazole-alt-5,5-(4′,7′-di2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) and [6, 6]phenyl-C71-butyric acid methyl ester (PC71BM). e effect
Absorption Spectral Studies. e absorption spectra of spray-coated active layers of PCDTBT : PC71BM from 1 : 4 ratio with and without TiOxx layer and spin-coated active layers with TiOxx layer are shown in Figure 3. e spincoated active layers show better absorption than the spraycoated active layers. e active layers with TiOxx layer possess relatively better optical absorption. is is because the optical spacer is a nonabsorbing layer that redistributes the maximum light intensity to be within the charge-separating bulk heterojunction layer
Summary
Organic solar cells (OSCs) are the best alternate for inorganic solar cells because of their low cost roll-to-roll production, and large area processability on exible substrates. erefore, organic solar cell (OSC) devices are of increasing interest as new materials for future light-activated energy sources. Spray-coating method has becomes important in the fabrication of large area polymer: fullerene based bulk heterojunction solar cells [15, 16]. We report the bulk heterojunction solar cell devices fabricated using the spray-deposited active layers of polymer blend materials of poly[N-9′′-hepta-decanyl-2,7-carbazole-alt-5,5-(4′,7′-di2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) and [6, 6]phenyl-C71-butyric acid methyl ester (PC71BM). Of various deposition parameters such as spraying time, substrate temperature, and substrate-nozzle distance has been investigated TiOxx layer redistributes the light intensity within the bulk heterojunction by changing the optical interference between the incident light and the light re ected from the metal electrode and enhances the power conversion efficiency of the solar cells [21]. Of various deposition parameters such as spraying time, substrate temperature, and substrate-nozzle distance has been investigated TiOxx layer redistributes the light intensity within the bulk heterojunction by changing the optical interference between the incident light and the light re ected from the metal electrode and enhances the power conversion efficiency of the solar cells [21]. erefore, in the present study, we have introduced TiOxx layer in between the active layer and metal electrode in order to improve the power conversion efficiency of the photovoltaic device
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