Balancing light absorptivity and carrier conductivity of graphene quantum dots for high-efficiency bulk heterojunction solar cells

Jung Kyu Kim, Myung Jin Park, Sang Jin Kim, Dong Hwan Wang, Sung Pyo Cho, Sukang Bae, Jong Hyeok Park, Byung Hee Hong

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

Graphene quantum dots (GQDs) have been considered as a novel material because their electronic and optoelectronic properties can be tuned by controlling the size and the functional groups of GQDs. Here we report the synthesis of reduction-controlled GQDs and their application to bulk heterojunction (BHJ) solar cells with enhanced power conversion efficiency (PCE). Three different types of GQDs - graphene oxide quantum dots (GOQDs), 5 h reduced GQDs, and 10 h reduced GQDs - were tested in BHJ solar cells, and the results indicate that GQDs play an important role in increasing optical absorptivity and charge carrier extraction of the BHJ solar cells. The enhanced optical absorptivity by rich functional groups in GOQDs increases short-circuit current, while the improved conductivity of reduced GQDs leads to the increase of fill factors. Thus, the reduction level of GQDs needs to be intermediate to balance the absorptivity and conductivity. Indeed, the partially reduced GQDs yielded the outstandingly improved PCE of 7.60% in BHJ devices compared to a reference device without GQDs (6.70%).

Original languageEnglish
Pages (from-to)7207-7212
Number of pages6
JournalACS Nano
Volume7
Issue number8
DOIs
Publication statusPublished - 2013 Aug 27

Fingerprint

Graphite
Graphene
Semiconductor quantum dots
Heterojunctions
heterojunctions
absorptivity
Solar cells
graphene
solar cells
quantum dots
conductivity
Oxides
Functional groups
Conversion efficiency
heterojunction devices
oxides
short circuit currents
Charge carriers
Short circuit currents
Optoelectronic devices

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Kim, J. K., Park, M. J., Kim, S. J., Wang, D. H., Cho, S. P., Bae, S., ... Hong, B. H. (2013). Balancing light absorptivity and carrier conductivity of graphene quantum dots for high-efficiency bulk heterojunction solar cells. ACS Nano, 7(8), 7207-7212. https://doi.org/10.1021/nn402606v
Kim, Jung Kyu ; Park, Myung Jin ; Kim, Sang Jin ; Wang, Dong Hwan ; Cho, Sung Pyo ; Bae, Sukang ; Park, Jong Hyeok ; Hong, Byung Hee. / Balancing light absorptivity and carrier conductivity of graphene quantum dots for high-efficiency bulk heterojunction solar cells. In: ACS Nano. 2013 ; Vol. 7, No. 8. pp. 7207-7212.
@article{00713c3a0d2943be9203d036cfe709b3,
title = "Balancing light absorptivity and carrier conductivity of graphene quantum dots for high-efficiency bulk heterojunction solar cells",
abstract = "Graphene quantum dots (GQDs) have been considered as a novel material because their electronic and optoelectronic properties can be tuned by controlling the size and the functional groups of GQDs. Here we report the synthesis of reduction-controlled GQDs and their application to bulk heterojunction (BHJ) solar cells with enhanced power conversion efficiency (PCE). Three different types of GQDs - graphene oxide quantum dots (GOQDs), 5 h reduced GQDs, and 10 h reduced GQDs - were tested in BHJ solar cells, and the results indicate that GQDs play an important role in increasing optical absorptivity and charge carrier extraction of the BHJ solar cells. The enhanced optical absorptivity by rich functional groups in GOQDs increases short-circuit current, while the improved conductivity of reduced GQDs leads to the increase of fill factors. Thus, the reduction level of GQDs needs to be intermediate to balance the absorptivity and conductivity. Indeed, the partially reduced GQDs yielded the outstandingly improved PCE of 7.60{\%} in BHJ devices compared to a reference device without GQDs (6.70{\%}).",
author = "Kim, {Jung Kyu} and Park, {Myung Jin} and Kim, {Sang Jin} and Wang, {Dong Hwan} and Cho, {Sung Pyo} and Sukang Bae and Park, {Jong Hyeok} and Hong, {Byung Hee}",
year = "2013",
month = "8",
day = "27",
doi = "10.1021/nn402606v",
language = "English",
volume = "7",
pages = "7207--7212",
journal = "ACS Nano",
issn = "1936-0851",
publisher = "American Chemical Society",
number = "8",

}

Balancing light absorptivity and carrier conductivity of graphene quantum dots for high-efficiency bulk heterojunction solar cells. / Kim, Jung Kyu; Park, Myung Jin; Kim, Sang Jin; Wang, Dong Hwan; Cho, Sung Pyo; Bae, Sukang; Park, Jong Hyeok; Hong, Byung Hee.

In: ACS Nano, Vol. 7, No. 8, 27.08.2013, p. 7207-7212.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Balancing light absorptivity and carrier conductivity of graphene quantum dots for high-efficiency bulk heterojunction solar cells

AU - Kim, Jung Kyu

AU - Park, Myung Jin

AU - Kim, Sang Jin

AU - Wang, Dong Hwan

AU - Cho, Sung Pyo

AU - Bae, Sukang

AU - Park, Jong Hyeok

AU - Hong, Byung Hee

PY - 2013/8/27

Y1 - 2013/8/27

N2 - Graphene quantum dots (GQDs) have been considered as a novel material because their electronic and optoelectronic properties can be tuned by controlling the size and the functional groups of GQDs. Here we report the synthesis of reduction-controlled GQDs and their application to bulk heterojunction (BHJ) solar cells with enhanced power conversion efficiency (PCE). Three different types of GQDs - graphene oxide quantum dots (GOQDs), 5 h reduced GQDs, and 10 h reduced GQDs - were tested in BHJ solar cells, and the results indicate that GQDs play an important role in increasing optical absorptivity and charge carrier extraction of the BHJ solar cells. The enhanced optical absorptivity by rich functional groups in GOQDs increases short-circuit current, while the improved conductivity of reduced GQDs leads to the increase of fill factors. Thus, the reduction level of GQDs needs to be intermediate to balance the absorptivity and conductivity. Indeed, the partially reduced GQDs yielded the outstandingly improved PCE of 7.60% in BHJ devices compared to a reference device without GQDs (6.70%).

AB - Graphene quantum dots (GQDs) have been considered as a novel material because their electronic and optoelectronic properties can be tuned by controlling the size and the functional groups of GQDs. Here we report the synthesis of reduction-controlled GQDs and their application to bulk heterojunction (BHJ) solar cells with enhanced power conversion efficiency (PCE). Three different types of GQDs - graphene oxide quantum dots (GOQDs), 5 h reduced GQDs, and 10 h reduced GQDs - were tested in BHJ solar cells, and the results indicate that GQDs play an important role in increasing optical absorptivity and charge carrier extraction of the BHJ solar cells. The enhanced optical absorptivity by rich functional groups in GOQDs increases short-circuit current, while the improved conductivity of reduced GQDs leads to the increase of fill factors. Thus, the reduction level of GQDs needs to be intermediate to balance the absorptivity and conductivity. Indeed, the partially reduced GQDs yielded the outstandingly improved PCE of 7.60% in BHJ devices compared to a reference device without GQDs (6.70%).

UR - http://www.scopus.com/inward/record.url?scp=84883259391&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84883259391&partnerID=8YFLogxK

U2 - 10.1021/nn402606v

DO - 10.1021/nn402606v

M3 - Article

VL - 7

SP - 7207

EP - 7212

JO - ACS Nano

JF - ACS Nano

SN - 1936-0851

IS - 8

ER -