Zhaoyang Han is a Ph.D. candidate at the Institute of Semiconductors, Chinese Academy of Sciences and University of Chinese Academy of Sciences. His research focuses on wide bandgap perovskite solar cells and perovskite-silicon tandem solar cells.
Qi Jiang is a professor at the Institute of Semiconductors, Chinese Academy of Sciences and the University of Chinese Academy of Sciences. She received her Ph.D. from the Institute of Semiconductors, Chinese Academy of Sciences in 2018. Then she worked as a postdoc at the University of North Carolina, at Chapel Hill and National Renewable Energy Laboratory from 2018 to 2023. Her research interests include new type semiconductor photoelectronic materials and devices.
Fig. 1.
(a) Schematic diagram of the monolithic perovskite/silicon tandem solar cell based on a double-side textured flexible silicon heterojunction solar cell, scanning electron microscopy (SEM) cross-sectional image on the right shows the perovskite top-cell layers and ~60 μm thin silicon bottom cell. (b) Schematic diagram of conventional atomic layer deposition (ALD) process for compact SnOx layer (left, purging time of 10 s), and loose SnOx layer (right, with significantly reduced purging time) under a chemical vapor deposition (CVD)-like growth mode. (c) Geometric phase analysis (GPA) of high-resolution transmission electron microscope (TEM) images of compact and loose SnOx layer. (d) Steady photoluminescence (PL) spectra of the perovskite (PVSK)/C60/SnOx samples and the PVSK/C60/SnOx/transparent conductive oxide (TCO) samples, where SnOx layers are deposited under different purging times. (e) Current density−voltage (J−V) curve and the maximum power output point of one 60-μm thick tandem device, measured by National Renewable Energy Laboratory (NREL) using the asymptotic maximum power scan method. (f) Current−voltage (I−V) curves of one M6 wafer-sized (~260 cm2) lightweight tandem device, certified by Fraunhofer ISE CalLab, the inset shows the weight of a complete M6-sized tandem solar cell with 4.386 g and derived a 1.77 W/g power-to-weight ratio. (g) Photograph of flexible perovskite/silicon tandem devices, which can be folded with a bending radius of 15 mm (25 mm). (h) Thermal cycling tests (−40 to 85 °C) for the encapsulated tandem solar cells. (i) Power conversion efficiency (PCE) evolution for wafer-sized lightweight unencapsulated tandem devices as a function of bending cycles, the inset shows PL mapping images of the tandem devices before and after bending test[22].
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