Interfacial modification in perovskite-based tandem solar cells

Abstract

With photovoltaic performance of metal halide perovskite-based solar cells skyrocketing to approximately 26% and approaching the theoretical Shockley–Queisser limit of single junction solar cells, researchers are now exploring multi-junction tandem solar cells that use perovskite materials to achieve high efficiency next-generation photovoltaics. Various types of bottom subcells, including silicon solar cells used commercially in industry, chalcogenide thin film cells, and perovskite cells, have been combined with perovskite top subcells on the strength of facile fabrication methods based on solution processes. However, owing to the nature that photovoltages of the subcells are added up and the structure containing numerous layers, interfacial issues that cause open-circuit voltage (VOC) deficit need to be handled carefully. In addition, morphological issues or process compatibility make it difficult to fabricate solution-processed perovskite top cells. In this paper, we summarize and review the fundamentals and strategies to overcome interfacial issues in tandem solar cells for high efficiency and stability confronting this field. Graphical Abstract

Band Gap Alteration of Halide Mixing in Hybrid Perovskites: A First-Principles Study with Statistical Analysis

“…Hybrid halide perovskites have made significant progress in optoelectronic applications due to their versatility and adaptable properties over the last decades. , However, the halogen mixing strategy in halide perovskites is a universal approach for enhancing solar cell device efficiencies and long-term stability. , The band gap of perovskites is a crucial factor that significantly influences the absorption of visible light. Accurate information about the crystal system at different halide content levels is essential, especially given the lack of consensus on the boundary between I-rich, Cl-rich, and Br-rich cubic phases .…”

Synergistic Surface Defect Passivation of Ionic Liquids for Efficient and Stable MAPbI3-Based Inverted Perovskite Solar Cells

“…Too many defects produce numerous nonradiative recombinations, which decrease the device performance. 8,9 Because of their ionic properties, which are related to organic-cation and halide vacancies and uncoordinated lead and iodine ions, perovskites contain various defects, which are often mainly concentrated at grain boundaries and on perovskite surfaces. 10−12 These defects capture charges, which generates nonradiative recombination and hysteresis and, thus, affects the device performance.…”

“…Among the various defects in PSCs, defects in the perovskite thin film and interfacial defects between the thin film and transport layer are the main causes of efficiency loss. Too many defects produce numerous nonradiative recombinations, which decrease the device performance. , …”