期刊
ADVANCED FUNCTIONAL MATERIALS
卷 29, 期 1, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201806479
关键词
band energy alignment; efficiency enhancement; guanidinium ion doping; perovskite solar cells; tunable hysteresis
类别
资金
- Australian Research Council Future Fellowship [FT120100674]
- Queensland-Chinese Academy of Science (Q-CAS) collaborative research fund
- Science and Engineering faculty, QUT
Current-voltage hysteresis of perovskite solar cells (PSCs) has raised the concern of accurate performance measurement in practice. Although various theories have been proposed to elucidate this phenomenon, the origin of hysteresis is still an open question. Herein, the use of guanidinium cation (Gu(+))-dopant is demonstrated to tailor the crystal structure of mixed-cation formamidinium-cesium lead triiodide (FA(0.83)Cs(0.17)PbI(3)) perovskite, resulting in an improved energy conversion efficiency and tunable current-voltage hysteresis characteristic in planar solar cells. Particularly, when the concentration of Gu-dopant for the perovskite film increases, the normal hysteresis initially observed in the pristine PSC is first suppressed with 2%-Gu-dopant, then changed to inverted hysteresis with a higher Gu-dopant. The hysteresis tunability behavior is attributed to the interplay of charge/ion accumulation and recombination at interfaces in the PSC. Furthermore, compared to the cell without Gu(+)-dopant, the optimal content of 2% Gu(+)-dopant also increases the device efficiency by 14%, reaching over 17% under one sun illumination.
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