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Emission-wavelength-dependent photoluminescence decay lifetime of N-functionalized graphene quantum dot downconverters: Impact on conversion efficiency of Cu(In, Ga)Se-2 solar cells

Title
Emission-wavelength-dependent photoluminescence decay lifetime of N-functionalized graphene quantum dot downconverters: Impact on conversion efficiency of Cu(In, Ga)Se-2 solar cells
Authors
Khan, FirozKim, Jae Hyeon
DGIST Authors
Kim, Jae Hyeon
Issue Date
2019-07
Citation
Scientific Reports, 9(1), 10803
Type
Article
Article Type
Article
Keywords
LUMINESCENCEENHANCEMENTFLUORESCENCEPERFORMANCEREDUCTIONLAYERS
ISSN
2045-2322
Abstract
Graphene quantum dots (GQDs) have several advantages over inorganic quantum dots owing to their beneficial properties. Recently, GQDs have been used as downconverters in photovoltaic devices. However, the application of GQDs in most emergent thin-film-based Cu(In, Ga)Se2 (CIGS) photovoltaic cells is limited because of either low photoluminescence (PL) quantum yield (QY) or a small Stokes shift (Δλ). Therefore, GQDs with an ultrahigh QY and large Δλ are essential to realizing the two emergent fields, i.e., the application of GQDs in CIGS photovoltaic solar cells. In this regard, we synthesized nitrogen-functionalized GQDs (NGQDs) with an ultrahigh QY (77–99%) and a large Δλ (95–155 nm) via tailoring of the nitrogen and oxygen moieties. The NGQDs were applied in CIGS solar cells to evaluate their downconversion efficiency. Our study shows that the emission wavelength (λem)-dependent photoluminescence decay lifetime (τem) determines the down-conversion efficiency of the nitrogen-functionalized graphene quantum dots. With the increase in τem at λem > 500 nm, the conversion efficiencies of the NGQDs coated-CIGS solar cells increased by 12.22%. Thus, the increase in τem at λem > 500 nm significantly increased the maximum current output and thus enhanced the solar-cell performance. © 2019, The Author(s).
URI
http://hdl.handle.net/20.500.11750/10403
DOI
10.1038/s41598-019-47068-w
Publisher
Nature Publishing Group
Related Researcher
Files:
Collection:
Division of Energy Technology1. Journal Articles


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