Interfacial Modification in Organic and Perovskite Solar Cells

Area of Science:

• Photovoltaics and Renewable Energy
• Materials Science and Engineering
• Organic and Hybrid Solar Cell Technologies

Background:

• Organic bulk heterojunction solar cells (OSCs) and hybrid halide perovskite solar cells (PSCs) are key next-generation photovoltaic technologies.
• Significant increases in power conversion efficiency (PCE) are attributed to advances in material synthesis, device processing, and interface engineering.
• Interfacial properties critically influence charge extraction, surface passivation, and recombination, directly impacting solar cell performance and stability.

Purpose of the Study:

• To review recent progress in interface modification strategies for OSCs and PSCs.
• To highlight methods for improving cathode and anode interfaces in OSCs.
• To discuss approaches for addressing interfacial traps and surface passivation in PSCs.

Main Methods:

• Review of interfacial doping techniques using biopolymers and ionic salts for OSC cathode modification.
• Analysis of anode interface strategies, including PEDOT:PSS surface improvement and alternative organic conjugated materials for OSCs.
• Examination of recent methods for interfacial trap passivation and surface modification in PSCs.

Main Results:

• Interfacial doping with biopolymers and ionic salts effectively modulates cathode interface properties in OSCs.
• Surface modification of PEDOT:PSS and exploration of novel organic materials offer pathways for anode interface enhancement in OSCs.
• Various approaches are being developed to mitigate interfacial traps and improve surface passivation in emerging PSCs.

Conclusions:

• Interface engineering is a critical factor for advancing both OSC and PSC technologies.
• Continued research into interface modification is essential for further improvements in PCE and long-term device stability.
• Addressing interfacial challenges presents significant opportunities for future solar cell development.