Zheng Daming, Pauporté Thierry, Schwob Catherine, Coolen Laurent
Sorbonne Université CNRS, Institut de NanoSciences de Paris, INSP Paris France.
Chimie ParisTech PSL Research University CNRS, Institut de Recherche de Chimie Paris (IRCP), Curie Paris France.
Exploration (Beijing). 2023 Sep 6;4(1):20220146. doi: 10.1002/EXP.20220146. eCollection 2024 Feb.
Numerous experiments have demonstrated improvements on the efficiency of perovskite solar cells by introducing plasmonic nanoparticles, however, the underlying mechanisms are still not clear: the particles may enhance light absorption and scattering, as well as charge separation and transfer, or the perovskite's crystalline quality. Eventually, it can still be debated whether unambiguous plasmonic increase of light absorption has indeed been achieved. Here, various optical models are employed to provide a physical understanding of the relevant parameters in plasmonic perovskite cells and the conditions under which light absorption may be enhanced by plasmonic mechanisms. By applying the recent generalized Mie theory to gold nanospheres in perovskite, it is shown that their plasmon resonance is conveniently located in the 650-800 nm wavelength range, where absorption enhancement is most needed. It is evaluated for which active layer thickness and nanoparticle concentration a significant enhancement can be expected. Finally, the experimental literature on plasmonic perovskite solar cells is analyzed in light of this theoretical description. It is estimated that only a tiny portion of these reports can be associated with light absorption and point out the importance of reporting the perovskite thickness and nanoparticle concentration in order to assess the presence of plasmonic effects.
大量实验表明，通过引入等离子体纳米颗粒可提高钙钛矿太阳能电池的效率，然而，其潜在机制仍不明确：这些颗粒可能会增强光吸收和散射，以及电荷分离与转移，或者改善钙钛矿的晶体质量。最终，等离子体是否真的实现了光吸收的明确增加仍存在争议。在此，采用各种光学模型来对等离子体钙钛矿电池中的相关参数以及通过等离子体机制增强光吸收的条件进行物理理解。通过将最新的广义米氏理论应用于钙钛矿中的金纳米球，结果表明它们的等离子体共振方便地位于650 - 800纳米波长范围内，这正是最需要增强吸收的区域。评估了对于何种有源层厚度和纳米颗粒浓度可预期有显著增强。最后，根据这一理论描述对等离子体钙钛矿太阳能电池的实验文献进行了分析。据估计，这些报告中只有一小部分与光吸收相关，并指出了报告钙钛矿厚度和纳米颗粒浓度对于评估等离子体效应存在的重要性。
