Enhanced Stability of Organic Photovoltaics by Additional ZnO Layers on Rippled ZnO Electron-collecting Layer using Atomic Layer Deposition

Abstract

We fabricated organic photovoltaic (OPV) based on ZnO ripple structure on indium tin oxide as electroncollecting layers and PTB7-F20 as donor polymer. In addition, atomic layer deposition (ALD) was used for preparing additional ZnO layers on rippled ZnO. Addition of 2 nm-thick ALD-ZnO resulted in enhanced initial OPV performance and stability. Based on photoluminescence results, we suggest that ALD-ZnO layers reduced number of surface defect sites on ZnO, which can act as electron-hole recombination center of OPV, and increased resistance of ZnO towards surface defect formation.

Visible and infrared photodiode based on γ-InSe/Ge van der Waals heterojunction for polarized detection and imaging

“…The fitting index deviates from 1, which indicates that the Auger recombination mainly occurred at the heterointerface. The photogenerated charges are partially trapped by the defect states, which is also reported in other vdWH photodetectors: 44 In addition, the power conversion efficiency (PCE) and fill factor (FF) represent the parameters of how much of the incident photon energy can be converted into effective electrical energy and the ability of the device to provide maximum output power to the outside world, respectively, both of which are key quality parameters of photovoltaic cells, which are defined as: 45,46 FF ¼ P ðel;maxÞ…”

“…In addition, the power conversion efficiency (PCE) and fill factor (FF) represent the parameters of how much of the incident photon energy can be converted into effective electrical energy and the ability of the device to provide maximum output power to the outside world, respectively, both of which are key quality parameters of photovoltaic cells, which are defined as: 45,46 …”

Review of tailoring ZnO for optoelectronics through atomic layer deposition experimental variables

“…3b). [69][70][71][72][73][74][75][76][77] Similarly, ALD ZnO can also be incorporated in hybrid solar cells, where the exciton dissociates at an organic/inorganic interface such as P3HT/ ZnO. [78][79][80] Another developing optoelectronic device that relies on semiconducting organic materials is the Hybrid Light Emitting Diode (HyLED).…”

Enhanced cell performance by controlling the surface morphology of ZnO buffer layers in organic photovoltaic cells

“…Recently, the cell performance of OPVs was sharply increased up to 8-12% with changing the various parameters (open circuit voltage (V oc ), current density (J sc ), fill factor (FF) and resistance, etc.) (Park et al, 2010;Zhang et al, 2010;Li et al, 2012;Kim et al, 2013Kim et al, , 2014. In order to get the high PCE of OPVs, it is important to decrease the resistance between the buffer layer and active layer because http://dx.doi.org/10.1016/j.solener.2015.07.047 0038-092X/Ó 2015 Elsevier Ltd. All rights reserved.…”