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
- 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
- 최원국; 박동희; 임근용; 김승욱; 최병일; 유재웅
- antireflection; damp heat; relative humidity; flexible transparent conducting electrode; organic photovoltaic; ultahigh moisture barriers
- Issue Date
- Advanced Energy and Sustainability Research
- VOL 온라인게재, 2100112
- 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.
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