Valluvar Oli Arivazhagan, Li Zinuo, Chen Yu, Ivaturi Aruna
Smart Materials Research and Device Technology (SMaRDT) Group, Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, Glasgow G1 1XL, U.K.
Department of Physics, University of Strathclyde, Glasgow G4 0RE, U.K.
ACS Appl Energy Mater. 2022 Dec 26;5(12):14669-14679. doi: 10.1021/acsaem.2c01560. Epub 2022 Nov 17.
Indoor light-energy-harvesting solar cells have long-standing history with perovskite solar cells (PSCs) recently emerging as potential candidates with high power conversion efficiencies (PCEs). However, almost all of the reported studies on indoor light-harvesting solar cells utilize white light in the visible wavelength. Low wavelength near-ultraviolet (UV) lights used under indoor environments are not given attention despite their high photon energy. In this study, perovskite solar cells have been investigated for the first time for harvesting energy from a commercially available near-UV (UV-A) indoor LED light (395-400 nm). Also called black lights, these near-UV lights are commonly used for decoration (e.g., in bars, pubs, aquariums, parties, clubs, body art studios, neon lights, and Christmas and Halloween decorations). The optimized perovskite solar cells with the -- architecture using the CHNHPbI absorber were fabricated and characterized under different illumination intensities of near-UV indoor LEDs. The champion devices delivered a PCE and power output of 20.63% and 775.86 μW/cm, respectively, when measured under UV illumination of 3.76 mW/cm. The devices retained 84.10% of their initial PCE when aged under near-UV light for 24 h. The effects of UV exposure on the device performance have been comprehensively characterized. Furthermore, UV-stable solar cells fabricated with a modified electron transport layer retained 95.53% of its initial PCE after 24 h UV exposure. The champion devices delivered enhanced PCE and power output of 26.19% and 991.21 μW/cm, respectively, when measured under UV illumination of 3.76 mW/cm. This work opens up a novel direction for energy harvesting from near-UV indoor light sources for applications in microwatt-powered electronics such as internet of things sensors.
室内光能收集太阳能电池有着悠久的历史，近年来钙钛矿太阳能电池（PSC）作为具有高功率转换效率（PCE）的潜在候选者崭露头角。然而，几乎所有已报道的关于室内光收集太阳能电池的研究都利用可见光波长范围内的白光。尽管室内环境中使用的低波长近紫外（UV）光具有较高的光子能量，但却未受到关注。在本研究中，首次对钙钛矿太阳能电池进行了研究，以收集市售近紫外（UV-A）室内LED灯（395 - 400 nm）的能量。这些近紫外光也被称为黑光，常用于装饰（例如在酒吧、酒馆、水族馆、派对、俱乐部、人体艺术工作室、霓虹灯以及圣诞和万圣节装饰中）。采用CHNHPbI吸收体的 - 结构优化钙钛矿太阳能电池在不同光照强度的近紫外室内LED下进行了制备和表征。在3.76 mW/cm²的紫外光照下测量时，最佳器件的PCE和功率输出分别为20.63%和775.86 μW/cm²。当在近紫外光下老化24小时后，器件保留了其初始PCE的84.10%。已全面表征了紫外线暴露对器件性能的影响。此外，用改性电子传输层制备的抗紫外线太阳能电池在紫外线暴露24小时后保留了其初始PCE的95.53%。在3.76 mW/cm²的紫外光照下测量时，最佳器件的PCE和功率输出分别提高到26.19%和991.21 μW/cm²。这项工作为从近紫外室内光源收集能量用于微瓦级供电电子设备（如物联网传感器）开辟了一个新方向。
