利用溶剂DMF处理聚合物太阳能电池的PEDOT:PSS阳极缓冲层提高能量转换效率

通过有机溶剂N,N-二甲基甲酰胺(DMF)处理P3HT:PCBM聚合物太阳能电池的PEDOT:PSS阳极缓冲层,能量转换效率得到了很大程度提高.DMF处理PEDOT:PSS阳极缓冲层主要有以下两种方式:①DMF 1∶4(v/v)混合原始的PEDOT:PSS溶液;②直接旋涂DMF在PEDOT:PSS阳极缓冲层上.其中后者的效果最为显著,器件结构为ITO/PEDOT:PSS/P3HT:PCBM/Al的电池通过直接旋涂DMF(3 000rpm)处理PEDOT:PSS阳极缓冲层后,电池效率由3.16%提高到4.27%,提高幅度为35%.为了探究电池能量转换效率提高的机理,我们测试表征了电池在光照和暗态下的I-V特性曲线及外量子效率(IPCE)光谱,PEDOT:PSS薄膜的透光性、导电性及表面形貌,光活性层P3HT:PCBM的紫外可见光吸收及表面形貌.一系列结果表明PEDOT:PSS薄膜的导电性增强及表面形貌变化有利于空穴的抽取和收集,P3HT:PCBM薄膜的表面形貌变化有利于活性层光吸收的增强和电子的收集.     

Luminescent and photovoltaic properties of poly（9,9-dioctylfluorene- co-bithiophene） in organic electronic devices

We studied the luminescent and photovoltaic properties of poly(9,9-dioctylfluorene-co-bithiophene)(F8T2) based on ITO/PEDOT:PSS/F8T2/Bphen/LiF(0 or 1 nm)/Al and ITO/PEDOT:PSS/F8T2:PCBM/Bphen/Al.A stable and bright yellow emission was obtained from polymer F8T2,and the electroluminescence power reached 45 ?W at a 15 V driving voltage.Polymer F8T2 shows a broad absorption band from 400 to 500 nm,and has a shorter absorption edge at about 560 nm compared to that of the typical electron donor P3HT(650 nm).The photoluminescence quenching of F8T2 occurs with only a small fraction of blended PCBM due to the effective exciton dissociation at the interface between F8T2 and PCBM.Polymer solar cells(PSCs) using F8T2:PCBM as the active layer show a low power conversion efficiency(PCE) of 0.10% with an open circuit voltage(Voc) of 0.91 V and short circuit current density(Jsc) of 0.23 mA/cm2.The PSCs using F8T2:P3HT:PCBM as the active layer have a Voc of 0.85 V and Jsc of 3.02 mA/cm2,improving the PCE by about 0.90%.We attribute the improved cell performance to the higher number of photons harvested by P3HT molecules.     

图案化聚合物电极及其在有机太阳能电池中应用

为了提高聚合物载流子迁移率,本文对图案化聚合物聚3,4-乙撑噻吩/聚苯乙烯磺酸盐(PEDOT∶PSS)作为半导体聚合物的基底对载流子迁移率的影响进行研究.以聚二甲基硅氧烷(PDMS)为模板,利用基于毛细力原理的软压印技术,使硬度系数很高的聚合物PEDOT∶PSS形成图案化结构.此压印方法可形成大面积高保真的图案,且适合工业化生产.阐述了图案化PEDOT∶PSS可增加与活性层的接触面积,从而缩短聚合物载流子的迁移路径,有效地提高了聚合物载流子的迁移率.同时图案化结构散射入射光进入活性层,促进活性层光的吸收,从而提高了光电流.最后,本文将图案化PEDOT∶PSS作为电极应用到有机太阳能电池聚3-已基噻吩与富勒烯衍生物(P3HT∶PCBM)共混体系中,对其研究发现图案化后的PEDOT∶PSS能有效地提高了太阳能电池P3HT∶PCBM共混体系的能量转换效率.     

退火处理对体异质结有机太阳能电池性能的影响

制备了结构为:ITO/PEDOT:PSS/P3HT+PCBM/LiF/Al的有机太阳能电池,研究退火对电池性能的影响,实验发现:经过60 min 150℃退火处理后,器件开路电压(Vo)c为0.57 V,短路电流密度(Js)c达到6.32 mA.cm-2,填充因子(FF)达到0.55,光电转换效率(ηp)达到2.01%,器件性能明显提高。探讨了退火对电池性能影响的内在原因。     

聚合物/富勒烯太阳能电池形貌优化研究

选用苯并二噻吩和噻吩并吡咯(PBDTTPD)作为给体材料,和经典的受体材料富勒烯衍生物PC61BM/PC71BM搭配制作如下器件结构:氧化铟锡导电玻璃ITO(160nm)/阳极修饰层PEDOT:PSS(40nm)/活性层PBDTTPD:PCBM(90nm)/阴极修饰层LiF(0.5nm)/金属阴极Al(120nm).采用溶剂退火和添加剂后处理方法,利用有机溶剂慢蒸发过程以及溶剂和添加剂不同的沸点,使得给体和受体材料完成自组装,形成有序的给受体互联贯穿网状结构.结果表明,溶剂退火可以极大地优化PBDTTPD:PCBM活性层的形貌,最高能量转换效率(Power Conversion Effciency,PCE)达到4.95%.该实验成果可以为进一步提高聚合物/富勒烯有机太阳能电池的效率,提供有力的理论依据和实验指导.     

导电聚合物作为连接层的叠层电致发光器件

有机电致发光器件(OLED)因具有全固态、主动发光、高色域、视角宽、非常轻薄和可折叠卷曲等优点,被认为是可取代液晶显示的技术之一.但是,由于这种器件使用的有机材料很容易与空气中的水和氧气发生反应,并且其玻璃化温度比较低,导致器件稳定性和效率比较低.因此通过某种方式提高器件的电流效率、减少器件的发热功耗,降低器件的运行电流,具有非常重要的意义.叠层(Stacked)器件结构技术是实现低电流、高效率OLED的一种有效途径.但是,如何利用简单的方法制作高效的叠层器件连接层,使电流高效地通过器件,是研制这种器件的重要挑战.本文利用PEDOT:PSS作为器件连接层,成功制备出结构为ITO/PEDOT:PSS (15 nm)/PFO(80 nm)/PEDOT:PSS (40 nm)/PFO (80 nm)/Al (70 nm)的叠层有机电致发光器件.通过研究叠层器件的电流-电压特性、电压-亮度特性和电流-效率特性发现,在未做任何特别优化的条件下,该叠层器件的启亮电压为12.3 V,启亮电流为1.39μA.电流效率(3.97 cd/A)是单层对比器件电流效率的8倍.更为重要的是,这种PEDOT:PSS新型叠层器件连接层既不需要高温蒸发镀膜也不需要掺杂.该方法既简化了Stacked叠层器件连接单元的制备工艺,避免了高温蒸镀对器件膜层的损伤,又克服了现有掺杂工艺原子散射对器件性能破坏的难题.同时,本文对PEDOT:PSS作为叠层有机电致发光器件连接层的物理机制进行了探讨.     

不同溶剂溶解聚合物光伏特性的研究

采用聚3-己基噻吩（P3HT）溶于不同溶剂作为光敏层制备光伏器件,器件结构为：ITO/PEDOT：PSS/P3HT/Al.我们分析了聚3-己基噻吩（P3HT）溶于不同溶剂制成的光敏层薄膜,并对光敏层薄膜的形貌通过原子力显微镜（AFM）进行了表征.研究发现,P3HT溶于氯苯的薄膜形貌最优,光伏特性最好,短路电流、开路电压都比溶于氯仿和二甲苯的高.     

基于杂原子三角烯和咔唑星形树枝状化合物的光限幅和光伏特性研究

采用z-扫描测试技术研究两代树枝状化合物(G1和G2)的光限幅特性.结果表明,G1的光限幅效应比G2好,是一种有应用前景的光限幅材料.用真空沉积和溶液旋转涂膜的方法,制备了结构为ITO/PEDOT:PSS/G1/PCBM/LiF/Al和ITO/PEDOT:PSS/G2:PCBM(1%)/LiF/Al的有机异质结光伏器件.在100 mW/cm2光强照射下,G1和G2具有相近的光伏性质,相应的能量转化效率为0.012%.     

PEDOT:PSS/Fe3O4复合薄膜的制备及其超电容性能研究

以价格低廉的Fe₃O₄纳米颗粒为填料,聚(3,4-乙烯二氧噻吩):聚(苯乙烯磺酸)(PEDOT:PSS)为基材制备复合材料,并采用高氯酸(HClO₄)对其进行后处理,获得PEDOT:PSS/Fe₃O₄柔性自支撑薄膜。利用扫描电子显微镜(SEM)、X-射线衍射仪(XRD)、X射线电子能谱(XPS)、拉曼光谱(Raman)对复合薄膜进行形貌和结构表征,并采用循环伏安(CV)和恒电流充放电(GCD)对其进行电化学性能分析。结果表明：经酸处理的PEDOT:PSS/Fe₃O₄复合薄膜表面粗糙,电化学性能得到较大提升,且倍率性能较好。在1 A/g时,放电比电容可达106 F/g,远远超出PEDOT:PSS原始膜和未处理的PEDOT:PSS/Fe₃O₄复合薄膜;在10 A/g时,放电比电容能够保持在81 F/g。     

9位芘和长链烷氧基苯取代的三联芴

采用Suzuki偶联反应制备了9位芘和长链烷氧基苯取代的三联芴ATF.热分析结果显示ATF具有良好的热稳定性,其热分解温度为430 ℃,玻璃化转变温度高达155 ℃.芘在芴9位的非共轭取代并没有改变共轭三联芴的高效率蓝光发射特点,但ATF的HOMO能级得以明显提高,这意味着空穴注入性能有明显的提高.ATF既可以采用真空蒸镀,又可以采用溶液旋涂的方法制备电致发光器件,旋涂器件(ITO/PEDOT∶ PSS(40 nm) /ATF(100 nm)/Ba/Al)的启动电压为7 V,最大外量子效率为0.62.     

Flexible organic light-emitting diodes with poly-3, 4-ethylenedioxythiophene as transparent anode

The flexible oragnic light-emitting diodes (OLEDs) fabricatedon poly-3, 4-ethylenedioxythiophene/polystyrenesulfonate (PEDOT/PSS) coated substrates were demonstrated. How the fabricating processes and the device structure will affect the device performance was studied and the atomic force microscopy was employed to analyze the mophorlogy of the conducting polymer anode. Under optimized conditions, flexible OLEDs with PEDOT anode showed the brightness up to 2760 cd/m² and maximum external quantum efficiency of 1.4%. These data are comparable to those of conventional flexible OLEDs with ITO anode.     

基于LabVIEW串口通信的太阳能电池I—V曲线测试系统的设计与应用

采用LabVIEW软件平台搭建一套自动化I-V曲线测试系统,系统的数据采集部分由LabVIEW8．5软件、VISA4．1库、Keithley2000数字源表、低压电源和计算机等软、硬件所组成．对结构为ITO／PEDOT：PSS／P3HT：PCBM／Al的有机太阳能电池进行的I-V曲线测试,开路电压为0．608V,短路电流为8．25mA／cm2,填充因子为0．662,电池的转换效率为3．32％,其结果与CHI660电化学测量系统测量的结果相近,表明此系统具有可靠性、实时胜和准确性等特点．     

P_3HT/PCBM基有机太阳能电池性能提高的研究

以P3HT作为电子给体材料,PCBM作为电子受体材料,制成不同厚度活性层的本体异质结有机太阳能电池.从I-V特性曲线分析了厚度对电池性能的影响.制备了添加PEDOTPSS和TiO2作为空穴阻挡层的有机电池,通过分析I-V特性曲线和吸收光谱,找到提高电池性能的方法.     

基于无机p型NiO缓冲层的钙钛矿发光二极管发光特性研究

【目的】研究如何提高溴基钙钛矿(CH3NH3PbBr3)发光二极管的发光亮度。【方法】通过在氧化铟锡(ITO)玻璃基底上引入无机p型NiO缓冲层与有机聚合物聚(3,4-亚乙二氧基噻吩)-聚(苯乙烯磺酸)(PEDOT∶PSS)形成有机/无机杂化空穴传输层,提高空穴注入效率,降低电子溢出。【结果】引入无机p型NiO缓冲层形成有机/无机杂化空穴传输层后,发光二极管的发光亮度提高了约1倍。【结论】该方法不仅可降低PEDOT∶PSS对ITO基底的腐蚀,还能显著提高空穴注入效率,提高发光二极管的发光亮度。     

双重优化对基于P3HT:PCBM有机太阳能电池效率的提高

有效提高太阳能电池对光的吸收效率是提高太阳能电池能量转换效率的重要因素.在以poly(3-hexylthiophene)(P3HT)为电子给体材料,[6,6]-phenyl C60-butyric acid methyl eater(PCBM)为电子受体材料的有机太阳能电池中,Poly-(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)与活性层之间插入不同厚度的P3HT层,并在P3HT层最佳厚度的基础上,进一步在活性层中掺杂不同比例的Ag纳米粒子,双重优化了电池器件.当插入45 nm的P3HT层及掺杂质量比为5%的Ag纳米粒子时活性层薄膜的形貌及内部结构得到了改善,电池对光的吸收,及外量子效率得到了显著地提高,并出现红移现象.在25°C,光强为100 mW/cm2的条件下测量其短路电流密度JSC为11.21 mA/cm2,能量转化效率PCE为3.79%.     

Tunable fabrication of single-crystalline CsPbI3 nanobelts and their application as photodetectors

Lead halide perovskites have received increasing attention recently as a candidate material in various optoelectronic areas because of their high performance as light absorbers. Herein, we report the growth of CsPbI3 nanobelts via a solution process. A single-crystalline CsPbI3 nanobelt with uniform morphology can be achieved by controlling the amount of PbI2. A single-crystalline CsPbI3 nanobelt possesses a mean width, length, and thickness of 100 nm, 5 μm, and 20 nm, respectively. In this work, photodetectors (PDs) based on individual CsPbI3 nano-belts are constructed and found to perform well with an external quantum efficiency and responsivity of 2.39 × 105％ and 770 A/W, respect-ively. The PDs also show a high detectivity of up to 3.12 × 1012 Jones, which is at par with that of Si PDs. The PDs developed in this work ex-hibit great promise in various optoelectronic nanodevices.     

A dye-sensitized solar cell based on PEDOT:PSS counter electrode

A counter electrode for dye-sensitized solar cell (DSSC) was prepared by coating poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) with high transparency and adhesion on a conducting FTO glass at low temperature. The surface morphology, conductivity, sheet resistance, redox properties and photoelectric properties of the PEDOT:PSS/carbon electrodes were observed using scanning electron microscopy, a four-probe tester and a CHI660D electrochemical measurement system. The experimental results showed that DSSCs had the best photoelectric properties for PEDOT:PSS/carbon counter electrodes annealed at 80°C under vacuum conditions. The overall energy conversion efficiency of the DSSC with PEDOT:PSS/carbon counter electrode and barrier layer reached 7.61% under irradiation from a simulated solar light with intensity of 100 mW/cm² (AM 1.5). The excellent photoelectric properties, simple preparation procedure and low cost allow the PEDOT:PSS/carbon electrode to be a credible alternative electrode for use in DSSCs.     

Fabrication of PEDOT/PSS-ZnO nanowire by self-assembly method under vacuum condition

Poly(3,4-ethylenedioxythiophene) (PEDOT) has at- tracted much attention due to its high conductivity, excel- lent environmental stability and chemical processabil- ity[1,2]. PEDOT/PSS dispersion is a water-soluble system using poly(styrene sulfonic acid) (PSS) as the doping counterion during polymerization. The inclusion of PSS results in better solubility and processability to the PE- DOT/PSS aqueous dispersion[3, 4]. Recently, synthesis of one-dimensional (1D) multifunc- tional co…