Progress in Charge Transfer in 2D Metal Halide Perovskite Heterojunctions Review #WorldResearchAwards




Introduction

Metal halide perovskite (MHP)-based heterojunctions have emerged as a transformative platform in optoelectronic materials research due to their layered crystal structures, tunable band gaps, and outstanding light–matter interaction. When combined with two-dimensional (2D) materials, these heterojunctions enable precise control over interfacial charge transfer, which is essential for high-performance optoelectronic devices. Understanding the fundamental mechanisms governing carrier generation, separation, and recombination at these interfaces is therefore a central research focus.

Charge Transfer Mechanisms at MHP/2D Interfaces

At the core of MHP-based heterojunction performance lies interfacial charge transfer. Band alignment between MHPs and 2D materials such as graphene, MoS₂, and WS₂ facilitates efficient electron–hole separation. Type-II band structures are particularly effective, allowing electrons and holes to migrate into different layers, thereby extending carrier lifetimes and reducing non-radiative recombination losses.

Role of Interface Engineering and Defect Passivation

Interface defects strongly influence carrier dynamics in heterojunctions. Research has shown that molecular passivation, surface treatments, and interface engineering can significantly suppress trap-assisted recombination. By reducing defect density and enhancing interfacial coupling, these strategies improve charge extraction efficiency and long-term device stability.

Ultrafast Carrier Dynamics and Thickness Effects

Ultrafast spectroscopy studies reveal that carrier transfer across MHP heterojunctions occurs on femtosecond to picosecond timescales. The thickness of the MHP layer plays a critical role in determining transfer rates and recombination pathways. Optimizing layer thickness enables balanced absorption, rapid charge separation, and efficient transport.

Optoelectronic Device Applications
MHP-based heterojunctions have demonstrated remarkable performance in photodetectors, solar cells, and light-emitting devices. Enhanced responsivity, faster response speeds, and higher energy conversion efficiencies are directly linked to optimized interfacial charge transfer. These systems also enable flexible and multilayer device architectures, broadening application potential.

Future Perspectives and Emerging Photonic Systems

Looking forward, the integration of band-engineering strategies, flexible substrates, and multilayer heterostructures opens new avenues for advanced optoelectronic and photonic technologies. MHP heterojunctions show strong promise for quantum photonics, wearable electronics, and next-generation energy devices, offering a fertile ground for both theoretical and experimental research.

Global Particle Physics Excellence Awards


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