Solution-processable functionalized graphene oxide as an efficient hole transport layer in organic photovoltaics

Area of Science:

• Materials Science
• Nanotechnology
• Renewable Energy

Background:

• Organic photovoltaics (OPVs) require efficient hole transport layers (HTLs) for optimal performance.
• PEDOT:PSS is a commonly used HTL but has limitations.
• Developing alternative HTLs is crucial for advancing OPV technology.

Purpose of the Study:

• To fabricate and evaluate solution-processable functionalized graphene oxide (SPFGO) thin films as HTLs in OPVs.
• To investigate the impact of SPFGO on the performance metrics of OPV devices.
• To compare SPFGO performance against conventional HTLs like PEDOT:PSS.

Main Methods:

• Fabrication of SPFGO thin films using solution-processing techniques.
• Integration of SPFGO films as HTLs in organic photovoltaic device architectures.
• Characterization of OPV device performance, including open-circuit voltage (V(oc)), short-circuit current density (J(sc)), fill factor (FF), and power conversion efficiency (PCE).

Main Results:

• SPFGO thin films were successfully fabricated and incorporated as HTLs.
• OPV devices with SPFGO exhibited improved performance metrics.
• The best device achieved V(oc) of 0.57 V, J(sc) of 7.7 mA/cm², FF of 0.65, and PCE of 2.90% at a 3 nm SPFGO thickness.
• Performance was comparable to devices using PEDOT:PSS HTLs.

Conclusions:

• SPFGO thin films demonstrate significant potential as effective HTLs in OPVs.
• SPFGO offers a promising, solution-processable alternative to PEDOT:PSS.
• Further research into SPFGO could lead to more efficient and stable OPV devices.