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

Title
Balancing light absorptivity and carrier conductivity of graphene quantum dots for high-efficiency bulk heterojunction solar cells
Authors
김정규박명진김상진Dong Hwan WangSung Pyo Cho배수강박종혁홍병희
Keywords
Light Absorptivity; Carrier Conductivity; Graphene Quantum Dot; Bulk Heterojunction; Solar Cells; light absorption
Issue Date
2013-08
Publisher
ACS Nano
Citation
VOL 7, NO 8, 7207-7212
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%).
URI
http://pubs.kist.re.kr/handle/201004/46010
ISSN
19360851
Appears in Collections:
KIST Publication > Article
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