POS5-0603
Thermally Crosslinked PEDOT:PSS Hole Transport Layers for Efficient and Stable Organic Solar Cells
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Myungjin KIM (KyungPook National University)
Co-Author(s)
Abstract
Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is one of the most widely used hole transport layer (HTL) materials in organic solar cells (OSCs), owing to its solution processability, optical transparency, and commercial accessibility. However, the inherent hygroscopic nature of the PSS component trmains a major limitation, as moisture uptake can induce morphological degradation, promote pinhole formation, and generate interfacial charge recombination sites, ultimately deteriorating device efficiency and operational stability. Herein, we report a thermally induced crosslinking strategy for PEDOT:PSS that enhances film robustness and hydrophobicity while preserving its favorable charge transport properties. The crosslinked PEDOT:PSS effectively suppresses moisture penetration and mitigates interfacial degradation under humid conditions. As a results, OSCs employing the crosslinked HTL achieve a power conversion efficiency (PCE) of 16.42%, surpassing that of control devices based on pristine PEDOT:PSS (PCE = 15.45%). Moreover, the crosslinked devices exhibit significantly improved stability, retaining their photovoltaic performance more effectively under prolonged exposure to elevated temperature and humidity. These results highlight thermally crosslinked PEDOT:PSS provides a simple, scalable, and effective HTL engineering strategy for simultaneously enhancing the efficiency and durability of OSCs, offering a promising route toward their practical deployment.
