期刊
SMALL
卷 18, 期 38, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202203319
关键词
ammonium diethyldithiocarbamate; four-terminal tandem solar cells; phase stable; wide-bandgap perovskite
类别
资金
- National Natural Science Foundation of China [62025403, 61721005]
- Natural Science Foundation of Zhejiang Province [LD22E020001]
- Pioneer and Leading Goose R&D Program of Zhejiang [2022C01215]
The addition of ammonium diethyldithiocarbamate (ADDC) as an additive in precursor solution can reduce phase segregation in wide-bandgap perovskite solar cells (PSCs), improving their phase stability and operation stability. This leads to highly efficient solar cells with a tailored bandgap and a groundbreaking open-circuit voltage (V-OC).
Wide-bandgap perovskite solar cells (PSCs) with an optimal bandgap between 1.7 and 1.8 eV are critical to realize highly efficient and cost-competitive silicon tandem solar cells (TSCs). However, such wide-bandgap PSCs easily suffer from phase segregation, leading to performance degradation under operation. Here, it is evident that ammonium diethyldithiocarbamate (ADDC) can reduce the detrimental I-2 back to I- in precursor solution, thereby reducing the density of deep level traps in perovskite films. The resultant perovskite film exhibits great phase stability under continuous illumination and 30-60% relative humidity conditions. Due to the suppression of defect proliferation and ion migration, the PSCs deliver great operation stability which retain over 90% of the initial power conversion efficiency (PCE) after 500 h maximum power point tracking. Finally, a highly efficient semitransparent PSC with a tailored bandgap of 1.77 eV, achieving a PCE approaching 18.6% with a groundbreaking open-circuit voltage (V-OC) of 1.24 V enabled by ADDC additive in perovskite films is demonstrated. Integrated with a bottom silicon solar cell, a four-terminal (4T) TSC with a PCE of 30.24% is achieved, which is one of the highest efficiencies in 4T perovskite/silicon TSCs.
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