Thermal degradation related to the PEDOT:PSS hole transport layer and back electrode of the flexible inverted organic photovoltaic module
- Authors
- Son, Hyung Jin; Park, Hong-Kwan; Moon, Ji Yeon; Ju, Byeong-Kwon; Kim, Sung Hyun
- Issue Date
- 1-4월-2020
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- SUSTAINABLE ENERGY & FUELS, v.4, no.4, pp.1974 - 1983
- Indexed
- SCIE
SCOPUS
- Journal Title
- SUSTAINABLE ENERGY & FUELS
- Volume
- 4
- Number
- 4
- Start Page
- 1974
- End Page
- 1983
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/56676
- DOI
- 10.1039/c9se00811j
- ISSN
- 2398-4902
- Abstract
- The hole transport layer (HTL) and back electrode play a significant role in the stability of the flexible organic photovoltaic (OPV) module. In particular, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), a widely used hole transport material, is known to be associated with many degrading factors in the OPV field. This study highlights the impact of the PEDOT:PSS layer on thermal stability using a thermal acceleration test of flexible OPV modules with the inverted structure of indium tin oxide/ZnO/photoactive layer/PEDOT:PSS/Ag. The results confirm that thermal degradation of the OPV devices depends on heat temperature, in which the OPV performance degrades by a notable decrease in the open-circuit voltage (V-oc) as the temperature increases from 65 degrees C to 85 degrees C. Moreover, the stability of V-oc is enhanced when the PEDOT:PSS layer is thicker and contains polar solvent DMSO as an additive, suggesting that the thermal degradation can correlate with the properties of the PEDOT:PSS layer. In addition, microscopy images of the active layers show that the surface damage is attributed to a residual solvent of the printed Ag electrode, thereby resulting in a thermally induced drop in the short circuit current density (J(sc)). More detailed descriptions are presented in this paper, and the results are expected to offer a comprehensive understanding of the thermal degradation mechanism of OPV modules.
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