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Title: Graphene quantum dots-incorporated cathode buffer for improvement of inverted polymer solar cells
Authors: Li, Chang Ming
Yang, Hong Bin
Wang, Xizu
Khoo, Si Yun
Liu, Bin
Dong, Yong Qian
Keywords: Quantum dots
Issue Date: 2013
Source: Yang, H. B., Dong, Y. Q., Wang, X., Khoo, S. Y., Liu, B., & Li, C. M. (2013). Graphene quantum dots-incorporated cathode buffer for improvement of inverted polymer solar cells. Solar Energy Materials and Solar Cells, 117, 214-218.
Series/Report no.: Solar Energy Materials and Solar Cells
Abstract: Graphene quantum dots (GQDs) are an emerging class of nanomaterials with unique photonic and electric properties. In this study, GQDs were prepared by a facile, inexpensive and high-yield hydrothermal method and were further used as a cathode buffer additive for inverted polymer solar cells due to a wide band gap (~3.3 eV) and well-matched energy level between GQDs–cesium carbonate (GQDs–Cs2CO3) modified indium tin oxide (3.8 eV) and high occupied molecular orbit of [6,6]-phenyl-C61-butyric acid methyl ester (3.7 eV). In comparison to inverted polymer solar cells using cesium carbonate (Cs2CO3) buffer layer, the power conversion efficiency of GQDs–Cs2CO3 based device showed 22% enhancement from 2.59% to 3.17% as a result of enhanced exciton dissociation and suppressed free charge recombination at cathode/polymer active layer interface by GQDs. This work provides a new application of GQDs in organic electronic devices.
ISSN: 0927-0248
DOI: 10.1016/j.solmat.2013.05.060
Rights: © 2013 Elsevier.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SCBE Journal Articles

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