Paliwal Abhyuday, Romero Manuel, Hengel Lennart van den, Rodkey Nathan, Zanoni Kassio P S, Lozano Gabriel, Roldán-Carmona Cristina, Sessolo Michele, Míguez Hernán, Bolink Henk J
Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Calle Catedrático José Beltrán 2, Paterna, 46980, Spain.
Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, Calle Américo Vespucio 49, Sevilla, 41092, Spain.
Adv Mater. 2025 Sep 10:e12861. doi: 10.1002/adma.202512861.
Formamidinium lead iodide perovskite compositions have a low open circuit voltage deficit and thus a higher power conversion efficiency (PCE) potential. However, their low bandgap makes it difficult to achieve a semitransparent perovskite solar cell (ST-PSC) with a high average visible transmittance (AVT) and thus, a high light utilization efficiency (LUE). Attaining a high AVT in such low bandgap perovskite‑based semitransparent solar cells requires the perovskite layer to be very thin (thickness < ≈100 nm) and the rear electrode to be made of a transparent conductive oxide. Moreover, both the front and rear electrodes should exhibit minimal reflectance losses. In this work, meeting these requirements, fully vacuum-deposited, low bandgap (≈1.55 eV, ≈100 nm thick) semitransparent perovskite solar cells are fabricated that demonstrate a high LUE value of 4.2 (PCE: 9.26% and AVT: 45.3%). Additionally, a high color rendering index of 82.4 along with a high AVT of ≈48.5% is achieved in a ST-PSC via modulation of the device reflectance by tuning both the perovskite layer thickness and the rear electrode stack. The ST‑PSCs retained > 90% of their efficiency for >1000 h when thermally stressed at 85 °C in N atmosphere.
甲脒碘化铅钙钛矿组合物具有较低的开路电压损失，因此具有更高的功率转换效率（PCE）潜力。然而，它们的低带隙使得难以实现具有高平均可见光透射率（AVT）的半透明钙钛矿太阳能电池（ST-PSC），从而难以实现高光利用效率（LUE）。在这种基于低带隙钙钛矿的半透明太阳能电池中实现高AVT需要钙钛矿层非常薄（厚度<≈100nm），并且背电极由透明导电氧化物制成。此外，前后电极都应表现出最小的反射损失。在这项工作中，满足这些要求，制备了完全真空沉积的低带隙（≈1.55eV，≈100nm厚）半透明钙钛矿太阳能电池，其显示出4.2的高LUE值（PCE：9.26％，AVT：45.3％）。此外，通过调节钙钛矿层厚度和背电极堆叠来调制器件反射率，在ST-PSC中实现了82.4的高显色指数以及≈48.5％的高AVT。当在N气氛中于85°C进行热应力测试时，ST-PSC在> 1000小时内保持其效率的> 90％。
