Presentation Details
Effect of Graphene Doped PEDOT:PSS as a Hole Transport Layer on Organic Solar Cell Performance

Wafa Alnaqbi, Shanavas Shajahan, Yarjan Abdul Samad, Ammar Nayfeh.

Khalifa University, Abu Dhabi, United Arab Emirates

Abstract


Organic solar cells (OSCs) have been an attractive and promising photovoltaic technology for low-cost and solution processable device fabrication. The hole transport layer (HTL) in the OSC structure plays a critical role in extracting and transporting the photogenerated holes; for this reason, the selected material for the HTL requires properties such as high mobility and conductivity, and for the p-i-n OSC configuration, high optical transparency to allow greater light absorption in the active layer. PEDOT:PSS is a widely used HTL in OSCs due to its high transparency and suitable work function, and it has relatively high electrical conductivity, which can be tuned through different approaches. This work studies the effect of doping PEDOT:PSS with graphene as an HTL for OSCs. Two OSCs were fabricated using PEDOT:PSS and graphene-doped PEDOT:PSS HTLs, and their performance was evaluated through I–V characteristics and external quantum efficiency (EQE) measurements. Adding 0.02 wt% graphene into PEDOT:PSS led to an increase in the Jsc from 20.73 mA/cm² for the device with undoped PEDOT:PSS to 22.4 mA/cm² for the graphene doped PEDOT:PSS solar cell. The EQE measurements also showed enhanced photocurrent generation for the solar cell with the graphene doped PEDOT:PSS HTL. These results indicate that doping with graphene is an effective approach to improve charge transport in PEDOT:PSS HTLs and enhance the performance of organic solar cells.

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