Research Article


2021, 14(11): 3893–3899


A GQD-based composite film as photon down-converter in CNT/Si solar cells

Xuewei Zhao1, Yizeng Wu1, Zhiyuan Xia1, Shulong Chang2, Yuanyuan Shang2 (✉), and Anyuan Cao1 (✉)

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1 School of Materials Science and Engineering, Peking University, Beijing 100871, China
2 School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China

Keywords: graphene quantum dots, polyvinyl pyrrolidone, energy-down-shift, external quantum efficiency, CNT/Si solar cells
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Graphene quantum dots (GQDs), have unique quantum confinement effects, tunable bandgap and luminescence property, with a wide range of potential applications such as optoelectronic and biomedical areas. However, GQDs usually have a strong tendency toward aggregation especially in making solid films, which will degrade their optoelectronic properties, for example, causing undesired fluorescence quenching. Here, we designed a composite film by embedding GQDs in a polyvinyl pyrrolidone (PVP) matrix through hydrogen bonding with well-preserved fluorescence, with a small addition of acid for compensating the poor conductivity of PVP. As a multifunctional solid coating on carbon nanotube/silicon (CNT/Si) solar cells, the photon down-conversion by GQDs and the PVP anti-reflection layer for visible light lead to enhanced external quantum efficiency (by 12.34% in the ultraviolet (UV) range) and cell efficiency (up to 14.94%). Such advanced optical managing enabled by low-cost, carbon-based quantum dots, as demonstrated in our results, can be applied to more versatile optoelectronic and photovoltaic devices based on perovskites, organic and other materials.
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A GQD-based composite film as photon down-converter in CNT/Si solar cells. Nano Res. 2021, 14(11): 3893–3899

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