Abstract
The ITO-free inverted SMPV1:PC71BM solar cells with an Al doped ZnO (AZO) transparent electrodes are fabricated. The AZO thin film prepared by pulsed laser deposition (PLD) technique exhibits high transmission (>85%) and low sheet resistance (~30 Ω/sq) and the power conversion efficiency (PCE) of devices based on AZO electrode can reach around 4%. To further enhance the light harvesting of the absorption layer of solar cells, ZnO nanorods interlayer is grown on the AZO layer before the deposition the active layer. The absorption spectrums of devices under various conditions are also simulated by RCWA method to identify the optical saturation length of the ZnO nanorods. The PCE of ITO-free inverted small molecule solar cell improved with ZnO nanorods can reach 6.6%.
Highlights
Organic photovoltaic (OPV) devices have great potentials for energy-generation applications in recent years due to its many advantages such as low cost, flexibility, light weight, large area, etc [1,2,3,4,5]
The conventional small molecule solar cells (SM-OPVs) based on a twodimensional conjugated small molecule material SMPV1 blended with phenyl-C71-butyric acid methyl ester (PC71BM), have achieved power conversion efficiency (PCE) of 8.0% [8,9].both polymer solar cells (PSCs) and SM-OPVs are typically fabricated on indium tin oxide (ITO) substrates, and do not make full use of the processing advantages of organic materials
This study demonstrates an efficient ITO-free inverted small molecule solar cells
Summary
Organic photovoltaic (OPV) devices have great potentials for energy-generation applications in recent years due to its many advantages such as low cost, flexibility, light weight, large area, etc [1,2,3,4,5]. The conventional small molecule solar cells (SM-OPVs) based on a twodimensional conjugated small molecule material SMPV1 blended with PC71BM, have achieved PCE of 8.0% [8,9].both PSCs and SM-OPVs are typically fabricated on indium tin oxide (ITO) substrates, and do not make full use of the processing advantages of organic materials. This study demonstrates an efficient ITO-free inverted small molecule solar cells. To further enhance the light harvesting capability of the ITO-free inverted SM-OPVs based on AZO electrode, a ZnO nanorods interlayer is grown on the AZO layer to increase the absorption of the active layer. The experiment results agree well with the simulation result, which optimizes the optical performance of the devices under the condition of maximum optical absorption
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