期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201706068
关键词
broad spectral photodetectors; low-bandgap Sn-rich perovskites; low noise currents; rubidium incorporation; ultraviolet-visible-near infrared detection
类别
资金
- University Grant Council of the University of Hong Kong [201611159194, 201511159225]
- General Research Fund [HKU711813, 17211916]
- Collaborative Research Fund from the Research Grants Council of Hong Kong Special Administrative Region, China [C7045-14E]
- CAS-Croucher Funding Scheme for Joint Laboratories [CAS14601]
- National Key RAMP
- D Program of China [2016YFB0700700]
- National Natural Science Foundation of China [51602211, 11674237]
- Natural Science Foundation of Jiangsu Province of China [BK20160299]
- [RGCAoE/P-02/12]
Solution-processed and low-temperature Sn-rich perovskites show their low bandgap of about 1.2 eV, enabling potential applications in next-generation cost-effective ultraviolet (UV)-visible (vis)-near infrared (NIR) photodetection. Particularly, the crystallization (crystallinity and orientation) and film (smooth and dense film) properties of Sn-rich perovskites are critical for efficient photodetectors, but are limitedly studied. Here, controllable crystallization for growing high-quality films with the improvements of increased crystallinity and strengthened preferred orientation through a introducing rubidium cation into the methylammonium Sn-Pb perovskite system (65% Sn) is achieved. Fundamentally, the theoretical results show that rubidium incorporation causes lower surface energy of (110) plane, facilitating growth in the dominating plane and suppressing growth of other competing planes. Consequently, the methylammonium-rubidium Sn-Pb perovskite photodetectors simultaneously achieve larger photocurrent and lower noise current. Finally, highly efficient UV-vis-NIR (300-1100 nm) photodetectors with record-high linear dynamic range of 110 and 3 dB cut-off frequency reaching 1 MHz are demonstrated. This work contributes to enriching the cation selection in Sn-Pb perovskite systems and offering a promising candidate for low-cost UV-vis-NIR photodetection.
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