期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 12, 页码 9458-9465出版社
AMER CHEMICAL SOC
DOI: 10.1021/am5017705
关键词
polymer solar cells; anode buffer layer; nickel acetate; UV-ozone treatment
资金
- NSFC [51173040, 91023039, 51303052]
- Ministry of Science and Technology of China (863 Project) [2011AA050523]
- SRFDP [20130036110007]
- Program for New Century Excellent Talents in University [NCET-12-0848]
- Beijing Higher Education Young Elite Program [YETP0713]
- 111 Project [B12034]
- Fundamental Research Funds for the Central Universities, China [13ZD11, 2014ZD11, 2014MS35]
Efficient polymer solar cells (PSCs) with enhanced open-circuit voltage (V-oc) are fabricated by introducing solution-processed and UV-ozone (UVO)-treated nickel acetate (O-NiAc) as an anode buffer layer. According to X-ray photoelectron spectroscopy data, NiAc partially decomposed to NiOOH during the UVO treatment. NiOOH is a dipole species, which leads to an increase in the work function (as confirmed by ultraviolet photoemission spectroscopy), thus benefitting the formation of ohmic contact between the anode and photoactive layer and leading to increased V-oc. In addition, the UVO treatment improves the wettability between the substrate and solvent of the active layer, which facilitates the formation of an upper photoactive layer with better morphology. Further, the O-NiAc layer can decrease the series resistance (R-s) and increase the parallel resistance (R-p) of the devices, inducing enhanced V-oc in comparison with the as-prepared NiAc-buffered control devices without UVO treatment. For PSCs based on the P3HT:PCBM system, V-oc increases from 0.50 to 0.60 V after the NiAc buffer layer undergoes UVO treatment. Similarly, in the P3HT:ICBA system, the V-oc value of the device with a UVO-treated NiAc buffer layer increases from 0.78 to 0.88 V, showing an enhanced power conversion efficiency of 6.64%.
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