Device Architecture for Perovskite Photovoltaics

Area of Science:

• Materials Science
• Renewable Energy
• Device Physics

Background:

• Solution-processed metal halide perovskites have driven significant advancements in perovskite photovoltaics.
• Device architecture is a critical factor influencing the performance of perovskite solar cells.

Purpose of the Study:

• To review the evolution of perovskite photovoltaic device architectures.
• To analyze mesoporous scaffold, planar heterojunction, and bulk heterojunction structures.
• To establish a framework linking architecture to charge transport, defects, and ion migration.

Main Methods:

• Analysis of "advantages - limitations - improvement paths" for each architecture.
• Correlation of device structures with core challenges in efficiency, stability, and scalability.
• Detailed examination of mesoporous and planar heterojunctions.

Main Results:

• Mesoporous and planar heterojunctions were analyzed for their role in perovskite solar cell development.
• Bulk heterojunctions offer advantages through nanoscale phase separation for improved charge transport and defect passivation.
• Key benefits include local band microalignment, minority-carrier highways, and restricted ion migration.

Conclusions:

• The bulk heterojunction architecture shows promise for enhancing perovskite solar cell performance.
• Future research should focus on bulk heterojunctions to accelerate commercialization.
• A roadmap for scaling up and commercializing perovskite photovoltaics is envisioned.