Spray-Coated MoO3 Hole Transport Layer for Inverted Organic Photovoltaics

被引:2
|
作者
Cha, Hou-Chin [1 ]
Li, Chia-Feng [2 ,3 ]
Chung, Tsui-Yun [1 ]
Ma, Wei-Yang [1 ]
Tsao, Cheng-Si [1 ,3 ]
Huang, Yu-Ching [2 ,4 ,5 ]
机构
[1] Natl Atom Res Inst, Dept Phys, Taoyuan 32546, Taiwan
[2] Ming Chi Univ Technol, Dept Mat Engn, New Taipei City 24301, Taiwan
[3] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei 10617, Taiwan
[4] Ming Chi Univ Technol, Organ Elect Res Ctr, New Taipei City 24301, Taiwan
[5] Chang Gung Univ, Coll Engn, Dept Chem & Mat Engn, Taoyuan 33302, Taiwan
关键词
inverted organic photovoltaics; MoO3 solution process; large-area spray coating; SOLAR-CELLS; LOW-TEMPERATURE; OXIDE; EFFICIENT;
D O I
10.3390/polym16070981
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
This study focuses on the hole transport layer of molybdenum trioxide (MoO3) for inverted bulk heterojunction (BHJ) organic photovoltaics (OPVs), which were fabricated using a combination of a spray coating and low-temperature annealing process as an alternative to the thermal evaporation process. To achieve a good coating quality of the sprayed film, the solvent used for solution-processed MoO3 (S-MoO3) should be well prepared. Isopropanol (IPA) is added to the as-prepared S-MoO3 solution to control its concentration. MoO3 solutions at concentrations of 5 mg/mL and 1 mg/mL were used for the spray coating process. The power conversion efficiency (PCE) depends on the concentration of the MoO3 solution and the spray coating process parameters of the MoO3 film, such as flow flux, spray cycles, and film thickness. The results of devices fabricated from solution-processed MoO3 with various spray fluxes show a lower PCE than that based on thermally evaporated MoO3 (T-MoO3) due to a limiting FF, which gradually increases with decreasing spray cycles. The highest PCE of 2.8% can be achieved with a 1 mg/mL concentration of MoO3 solution at the sprayed flux of 0.2 mL/min sprayed for one cycle. Additionally, S-MoO3 demonstrates excellent stability. Even without any encapsulation, OPVs can retain 90% of their initial PCE after 1300 h in a nitrogen-filled glove box and under ambient air conditions. The stability of OPVs without any encapsulation still has 90% of its initial PCE after 1300 h in a nitrogen-filled glove box and under air conditions. The results represent an evaluation of the feasibility of solution-processed HTL, which could be employed for a large-area mass production method.
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页数:11
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