Exploitation of Imporved Long-Term stability and enhanced photoconversion efficiency of organic photovoltaics Using Flexible Transparent conducting Electrode with dual functions of Antireflection an ultrahigh moisture barrier

Title
Exploitation of Imporved Long-Term stability and enhanced photoconversion efficiency of organic photovoltaics Using Flexible Transparent conducting Electrode with dual functions of Antireflection an ultrahigh moisture barrier
Authors
최원국박동희임근용김승욱최병일유재웅
Keywords
antireflection; damp heat; relative humidity; flexible transparent conducting electrode; organic photovoltaic; ultahigh moisture barriers
Issue Date
2021-07
Publisher
Advanced Energy and Sustainability Research
Citation
VOL 온라인게재, 2100112
Abstract
A structure of flexible glass/flexible transparent conducting electrode (TCE) comparable with the conventional glass/indium tin oxide (ITO) substrate is proposed by combining an Ag NW?+?PEDOT:PSS hybrid TCE (h-TCE) with triple-layer a-SiNx:H/n-SiOxNy/h-SiOx ultrahigh barrier (UHB) films. The UHB films have dual functions of both moisture barriers with a water vapor transmission rate (WVTR) of 1.6?×?10?5?×?g?m?2?day?1 and antireflection (AR) with a gradient refractive index. Flexible PTB7:PC70BM-based organic photovoltaics (OPVs) with the AR-UHB film achieve a maximum power conversion efficiency (PCE) of ηmax?=?8.33%, saturation current density (Jsc) of 17.67?mA?cm?2, and external quantum efficiency (EQE) of 63.3%, which are higher than ηmax?=?7.63%, Jsc?=?15.25?mA?cm?2, and EQE?=?59.26% of the OPVs on glass/ITO. These result from the increase in the absorption of the donor PTB7 due to the AR effect of the UHB films. A long-term stability of the AR-UHB encapsulation layer in damp heat (40?°C/85% relative humidity [RH]) is confirmed by the result that the measured T80 and T50 values for the OPV device on glass/ITO encapsulated with the AR-UHB film are about 1008?h (42?days) and 2205?h (92?days), respectively.
URI
http://pubs.kist.re.kr/handle/201004/73539
ISSN
2699-9412
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