Nonconjugated Anionic Polyelectrolyte as an Interfacial Layer for the Organic Optoelectronic Devices

被引:51
作者
Lim, Gyeong Eun [1 ]
Ha, Ye Eun [1 ]
Jo, Mi Young [1 ]
Park, Juyun [2 ]
Kang, Yong-Cheol [2 ]
Kim, Joo Hyun [1 ]
机构
[1] Pukyong Natl Univ, Dept Polymer Engn, Pusan 608739, South Korea
[2] Pukyong Natl Univ, Dept Chem, Pusan 608739, South Korea
基金
新加坡国家研究基金会;
关键词
nonconjugated anionic polyelectrolyte; interfacial layer; electron transporting/injecting layer; optoelectronic device; interface dipole; electrical contact resistance; LIGHT-EMITTING-DIODES; POLYMER SOLAR-CELLS; BENZOIC-ACID DERIVATIVES; ENERGY-LEVEL ALIGNMENT; CONJUGATED POLYELECTROLYTE; PHOTOVOLTAIC CELLS; HIGH-PERFORMANCE; TITANIUM-OXIDE; WORK FUNCTION; CATHODE;
D O I
10.1021/am400478b
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A nonconjugated anionic polyelectrolyte, poly(sodium 4-styrenesulfonate) (PSS-Na), was applied to the optoelectronic devices as an interfacial layer (IFL) at the semiconducting layer/cathode interface. The ultraviolet photoelectron spectroscopy and the Kelvin probe microscopy studies support the formation of a favorable interface dipole at the organic/cathode interface. For polymer light-emitting diodes (PLEDs), the maximum luminance efficiency (LEmax)and the turn-on voltage (V-on) of the device with a layer of PSS-Na spin-coated from the concentration of 0.5 mg/mL were 3.00 cd/A and 5.5 V, which are dramatically improved than those of the device without an IFL (LEmax = 0.316 cd/A, V-on = 9.5 V). This suggests that the PSS-Na film at the emissive layer/cathode interface improves the electron injection ability. As for polymer solar cells (PSCs), the power conversion efficiency (PCE) of the device with a layer of PSS-Na spin-coated from the concentration of 0.5 mg/mL was 2.83%, which is a 16% increase compared to that of the PSC without PSS-Na. The PCE improvement is mainly due to the enhancement of the short-circuit current (12% increase). The results support that the electron collection and transporting increase by the introduction of the PSS-Na film at the photoactive layer/cathode interface. The improvement of the efficiency of the PLED and PSC is due to the reduction of the Schottky barrier by the formation of a favorable interface as well as the better Ohmic contact at the cathode interface.
引用
收藏
页码:6508 / 6513
页数:6
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