Kim, Jung Kyu Kim, Sang Jin Park, Myung Jin Bae, Sukang Cho, Sung-Pyo Du, Qing Guo Wang, Dong Hwan Park, Jong Hyeok Hong, Byung Hee 2024-01-20T06:03:31Z 2024-01-20T06:03:31Z 2021-09-05 2015-09-22 2045-2322 https://pubs.kist.re.kr/handle/201004/124999 Graphene quantum dots (GQDs), a newly emerging 0-dimensional graphene based material, have been widely exploited in optoelectronic devices due to their tunable optical and electronic properties depending on their functional groups. Moreover, the dispersibility of GQDs in common solvents depending on hydrophobicity or hydrophilicity can be controlled by chemical functionalization, which is particularly important for homogeneous incorporation into various polymer layers. Here we report that a surface-engineered GQD-incorporated polymer photovoltaic device shows enhanced power conversion efficiency (PCE), where the oxygen-related functionalization of GQDs enabled good dispersity in a PEDOT:PSS hole extraction layer, leading to significantly improved short circuit current density (J(sc)) value. To maximize the PCE of the device, hydrophobic GQDs that are hydrothermally reduced (rGQD) were additionally incorporated in a bulk-heterojunction layer, which is found to promote a synergistic effect with the GQD-incorporated hole extraction layer. English NATURE PUBLISHING GROUP HETEROJUNCTION SOLAR-CELLS CONDUCTING POLYMER HOLE EXTRACTION ACTIVE LAYER OXIDE-FILMS DEVICES EFFICIENCY NANOPARTICLES TRANSPARENT ENHANCEMENT Surface-Engineered Graphene Quantum Dots Incorporated into Polymer Layers for High Performance Organic Photovoltaics Article 10.1038/srep14276 1 SCIENTIFIC REPORTS, v.5 SCIENTIFIC REPORTS 5 scie scopus 000361517600002 2-s2.0-84942134336 Multidisciplinary Sciences Science & Technology - Other Topics Article HETEROJUNCTION SOLAR-CELLS CONDUCTING POLYMER HOLE EXTRACTION ACTIVE LAYER OXIDE-FILMS DEVICES EFFICIENCY NANOPARTICLES TRANSPARENT ENHANCEMENT Surface-engineering Graphene Quantum Dots OPV