標題: Hydrogen plasma-treated MoSe2 nanosheets enhance the efficiency and stability of organic photovoltaics
作者: Wang, Hao-Cheng
Lin, Yu-Che
Chen, Chung-Hao
Huang, Chi-Hsien
Chang, Bin
Liu, Yi-Ling
Cheng, Hao-Wen
Tsao, Cheng-Si
Wei, Kung-Hwa
交大名義發表
材料科學與工程學系
National Chiao Tung University
Department of Materials Science and Engineering
公開日期: 7-十月-2019
摘要: In this paper we report the effect on the power conversion efficiency (PCE) and stability of photovoltaic devices after incorporating hydrogenated two-dimensional (2D) MoSe2 nanosheets into the active layer of bulk heterojunction (BHJ) organic photovoltaics (OPV). The surface properties of 2D MoSe2 nanosheets largely affect their dispersion in the active layer blend and, thus, influence the carrier mobility, PCE, and stability of corresponding devices. We treated MoSe2 nanosheets with hydrogen plasma and investigated their influence on the polymer packing and fullerene domain size of the active layer. For the optimized devices incorporating 37.5 wt% of untreated MoSe2, we obtained a champion PCE of 9.82%, compared with the champion reference PCE of approximately 9%. After incorporating the hydrogen plasma-treated MoSe2 nanosheets, we achieved a champion PCE of 10.44%-a relative increase of 16% over that of the reference device prepared without MoSe2 nanosheets. This PCE is the one of the highest ever reported for OPVs incorporating 2D materials. We attribute this large enhancement to the enhanced exciton generation and dissociation at the MoSe2-fullerene interface and, consequently, the balanced charge carrier mobility. The device incorporating the MoSe2 nanosheets maintained 70% of its initial PCE after heat-treatment at 100 degrees C for 1 h; in contrast, the PCE of the reference device decreased to 60% of its initial value-a relative increase in stability of 17% after incorporating these nanosheets. We also incorporated MoSe2 nanosheets (both with and without treatment) into a polymer donor (PBDTTBO)/small molecule (IT-4F) acceptor system. The champion PCEs reached 7.85 and 8.13% for the devices incorporating the MoSe2 nanosheets with and without plasma treatment, respectively-relative increases of 8 and 12%, respectively, over that of the reference. These results should encourage a push toward the implementation of transition metal dichalcogenides to enhance the performances of BHJ OPVs.
URI: http://dx.doi.org/10.1039/c9nr06611j
http://hdl.handle.net/11536/153074
ISSN: 2040-3364
DOI: 10.1039/c9nr06611j
期刊: NANOSCALE
Volume: 11
Issue: 37
起始頁: 17460
結束頁: 17470
顯示於類別:期刊論文