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Breaking the Size Limitation of Directly-Synthesized PbS Quantum Dot Inks Toward Efficient Short-wavelength Infrared Optoelectronic Applications |
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| Authors: | Yang Liu Yiyuan Gao Qian Yang Gao Xu Xingyu Zhou Dr. Guozheng Shi Xingyi Lyu Hao Wu Jun Liu Shiwen Fang Muhammad Irfan Ullah Leliang Song Kunyuan Lu Prof. Muhan Cao Prof. Qiao Zhang Tao Li Prof. Jianlong Xu Prof. Suidong Wang Prof. Zeke Liu Prof. Wanli Ma |
| Affiliation: | 1. Institute of Functional Nano & Soft Materials (FUNSOM), Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123 Jiangsu, P. R. China These authors contributed equally to this work. Contribution: Investigation (lead), Methodology (lead), Writing - original draft (lead);2. Institute of Functional Nano & Soft Materials (FUNSOM), Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123 Jiangsu, P. R. China These authors contributed equally to this work.;3. Institute of Functional Nano & Soft Materials (FUNSOM), Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123 Jiangsu, P. R. China;4. Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL, 60115 USA;5. Institute of Functional Nano & Soft Materials (FUNSOM), Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123 Jiangsu, P. R. China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou, 215123 Jiangsu, P. R. China;6. Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL, 60115 USA X-ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL, 60439 USA |
| Abstract: | PbS quantum dots (QDs) are promising building blocks for solution-processed short-wavelength infrared (SWIR) devices. The recently developed direct synthesis of semi-conductive PbS QD inks has substantially simplified the preparation processing and reduced the material cost, while facing the challenge to synthesize large-size QDs with absorption covering the SWIR region. Herein, we for the first time realize a low-cost, scalable synthesis of SWIR PbS QD inks after an extensive investigation of the reaction kinetics. Finally, based on these PbS SWIR QD inks, the solar cell demonstrates a record-high power conversion efficiency (PCE) of 1.44 % through an 1100 nm cutoff silicon filter and the photodetector device shows a low dark current density of 2×10−6 A cm−2 at −0.8 V reverse bias with a high external quantum efficiency (EQE) of 70 % at ≈1300 nm. Our results realize the direct synthesis of low-cost and scalable SWIR QD inks and may accelerate the industrialization of consumer SWIR technologies. |
| Keywords: | PbS Photodetector Quantum Dots Short-Wavelength Infrared Solar Cells |