Design of a Solar Cell Comprising Multiple Nanoheterojunctions: Theoretical Insights Based on Data Analysis

Reducing the overall cost of silicon solar cells while maintaining performance is crucial for commercialization. This study investigates a non-conventional approach to solar cell design that integrates non-crystalline silicon with nanosized crystalline lead chalcogenides (Si:PbX) (X = S, Se, Te) to lower costs and enhance performance through the creation of multiple nanoheterojunction structures. Utilizing the principle of self-organization, the theoretical model of the heterojunction supports the feasibility of growing PbX nanocrystals as coherent nanostructures on silicon surfaces. The study systematically evaluates the influence of material properties on solar cell efficiency, particularly focusing on the formation of the contact field and its effects on the device’s electrical performance. Si:PbX demonstrates significant multi-exciton generation and carrier multiplication effects, which present substantial potential for improving solar cell efficiency while maintaining comparable contact field parameters to traditional silicon solar cells. These findings may endow the rational design of solar cells with multiple nanoheterojunction Si:PbX for practical applications.

降低硅太阳能电池的综合成本并维持其性能表现，对于其商业化推广至关重要。本研究探索了一种非传统的太阳能电池设计方案：将非晶硅与纳米级结晶硫族铅化物（nanosized crystalline lead chalcogenides，记为PbX，其中X=S、Se、Te）相结合，构建Si:PbX复合体系，通过形成多纳米异质结结构实现成本降低与性能提升的双重目标。本研究依托自组织原理构建异质结理论模型，证实了在硅表面生长相干纳米结构PbX纳米晶体的可行性；同时系统评估了材料特性对太阳能电池效率的影响，重点聚焦于接触场的形成过程及其对器件电学性能的作用机制。研究结果表明，Si:PbX体系展现出显著的多激子生成与载流子倍增效应，在保持与传统硅太阳能电池相当的接触场参数的同时，具备大幅提升太阳能电池效率的巨大潜力，可为面向实际应用的多纳米异质结Si:PbX型太阳能电池的合理化设计提供理论支撑。