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Efficient quantum dot infrared solar cells with enhanced lowenergy photon conversion via optical engineering

Nano Research 2023年第2期16卷 2392-2398页

作者： Sisi Liu Ming-Yu Li Kao Xiong Jianbo Gao Xinzheng Lan Daoli Zhang Liang Gao Jianbing Zhang Jiang Tang School of Science Wuhan University of TechnologyWuhan 430070China School of Optical and Electronic Information Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology(HUST)Wuhan 430074China Department of Chemistry Brock UniversitySt.CatharinesON L2S 3A1Canada Wenzhou Advanced Manufacturing Technology Research Institute Huazhong University of Science and TechnologyWenzhou 325035China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518057China Optics Valley Laboratory Wuhan 430074China

Infrared(IR)solar cells are promising devices for improving the power conversion efficiency(PCE)of conventional solar cells by expanding the utilization region of the sunlight spectrum to near-infrared *** solar cells based on colloidal quantum dots(QDs)have attracted extensive attention due to the widely tunable absorption spectrum controlled by dot size and the unique solution ***,the trade-off in QD solar cells between light absorption and photo-generated carrier collection has limited the further improvement of ***,we present high-performance PbS QD IR solar cells resulting from the combination of boosted light absorption and optimized carrier *** constructing an optical resonance cavity,the light absorption is significantly enhanced in the range of 1,150–1,300 nm at a relatively thin photoactive ***,the thin photoactive layer facilitates efficient carrier ***,the PbS QD IR solar cells exhibit a highly efficient photoelectric conversion in the IR region,resulting in a high IR PCE of 1.3%which is comparable to the highest value of solution-processed IR solar cells based on PbSe *** results demonstrate that constructing an optical resonance cavity is a reasonable strategy for effective conversion of photons in the devices aiming at light in a relatively narrow wavelength range,such as IR solar cells and narrow band photodetectors.

关键词： infrared solar cells PbS quantum dots optical resonance carrier extraction

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Recent progress in colloidal quantum dot photovoltaics

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Frontiers of Optoelectronics 2015年第3期8卷 241-251页

作者： Xihua WANG Department of Electrical and Computer Engineering University of Alberta Edmonton Alberta T6G 2V4 Canada

The development of photovoltaic devices, solar cells, plays a key role in renewable energy sources. Semiconductor colloidal quantum dots （CQDs）, including lead chacolgenide CQDs that have tunable electronic bandgaps from infrared to visible, serve as good candidates to harvest the broad spectrum of sunlight. CQDs can be processed from solution, allowing them to be deposited in a roll-to-roll printing process compatible with low-cost fabrication of large area solar panels. Enhanced multiexciton generation process in CQD, compared with bulk semiconductors, enables the potential of exceeding Shockley-Queisser limit in CQD photovoltaics. For these advantages, CQDs photovoltaics attract great attention in academics, and extensive research works accelerate the development of CQD based solar cells. The record efficiency of CQD solar cells increased from 5.1% in 2011 to 9.9% in 2015. The improvement relies on optimized material processing, device architecture and various efforts to improve carrier collection efficiency. In this review, we have summarized the progress of CQD photovoltaics in year 2012 and after. Here we focused on the theoretical and experimental works that improve the understanding of the device physics in CQD solar cells, which may guide the development of CQD photovoltaics within the research community.

关键词： colloidal quantum dot (CQD) solar cell,photovoltaics carrier extraction light trapping

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