Wide-Gap Perovskite via Synergetic Surface Passivation and Its Application toward Efficient Stacked Tandem Photovoltaics.
Superior bandgap tunability enables solution-processed halide perovskite a promising candidate for multi-junction photovoltaics (PVs). Particularly, optically coupling wide-gap perovskite by stacking with commercially available PVs such as silicon and CIGS (also known as 4-terminal tandem) simplifies the technology transfer process, and further advances the commercialization potential of perovskite technology. However, compared with matured PV materials and the phase-pure FAPbI3 , wide-gap perovskite still suffers from huge voltage deficits. Here, the authors take advantage of the synergetic effect behind a sequential fluoride and organic ammonium salt surface passivation strategy to control non-radiative energy losses, and obtained a 17.7% efficiency in infrared-transparent wide-gap perovskite solar cells (21.1% for opaque device), and achieved efficiencies of over 25% when stacked with commercial Si and CIGS products with original PCEs of 18-20% under a 4-terminal working condition.
['Huang|Tianyi|T|', 'Wang|Rui|R|', 'Nuryyeva|Selbi|S|', 'Tan|Shaun|S|', 'Xue|Jingjing|J|', 'Zhao|Yepin|Y|', 'Wu|Quantan|Q|', 'Weber|Marc H|MH|', 'Cheng|Pei|P|', 'Meng|Dong|D|', 'Yavuz|Ilhan|I|', 'Houk|K N|KN|', 'Yang|Yang|Y|https://orcid.org/0000-0001-8833-7641']
defect passivation tandem structure wide bandgap perovskites