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

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,...

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Bibliographic Details
Published in:Nano research 2021-11, Vol.14 (11), p.3893-3899
Main Authors: Zhao, Xuewei, Wu, Yizeng, Xia, Zhiyuan, Chang, Shulong, Shang, Yuanyuan, Cao, Anyuan
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedical materials
Biomedicine
Biotechnology
Carbon
Carbon nanotubes
Chemistry and Materials Science
Condensed Matter Physics
Down-converters
Embedding
Fluorescence
Graphene
Hydrogen bonding
Light reflection
Materials Science
Nanotechnology
Optoelectronic devices
Perovskites
Photons
Photovoltaic cells
Photovoltaics
Polyvinylpyrrolidone
Quantum confinement
Quantum dots
Quantum efficiency
Research Article
Silicon
Solar cells
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Summary: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.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-021-3311-5