摘要
对以PTB7:PC_(70)BM为体系的聚合物太阳电池(BHJ)的阳极修饰层PEDOT:PSS中掺杂聚乙二醇(PEG)的方法进行研究,发现阳极修饰层中掺杂不同浓度的PEG后,器件的各项性能均有所提升。通过电流电压(I-V)测试、电容-电压(C-V)测试、外量子效率(EQE)测试、及不同浓度PEG下PEDOT:PSS的电导率的测量发现,在PEDOT:PSS中掺杂体积比为1%的PEG时,太阳电池器件的填充因子(FF)、短路电流(J_(sc))等有明显提升。其光电转换效率从5.88%升至6.48%,比基础器件提高10%。
The effect of adding different volume ratio polyethylene glycol(PEG) on the performance of bulk heterojunction(BHJ)organic solar cells based on poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophene-4,6-diyl]](PTB7)and[6,6]-phenyl-C70-butyric acid methyl ester(PC_(70) BM)was investigated. Under capacitance-voltage(C-V)measurement and I-V measurement,it provwres that devices with 1% volume ratio PEG exhibit higher current density( J_(sc)),fill factor(FF)and power conversion efficiency(PCE)from 5.88% to 6.48%,10% higher than that of the device without the incorporation of PEG.
引文
[1] Liang Yongye,Xu Zheng,Xia Jiangbin,et al. For the bright future-bulk heterojunction polymer solar cells with power conversion efficiency of 7.4%[J].Advanced Materials,2010,22(20):E135—E142.
[2] Moliton A,Nunzi J M. How to model the behaviour of organic photovoltaic cells[J]. Polymer International,2006,55(6):583—600.
[3] Liang Yongye, Yu Luping. Development of semiconducting polymers for solar energy harvesting[J].Polymer Reviews,2010,50(4):454—473.
[4] Hau S K,Yip Hin-Lap,Jen A K-Y. A review on the development of the inverted polymer solar cell architecture[J]. Polymer Reviews,2010,50(4):474—510.
[5] Lyu Peiwen,Chen Shan-Ci,Zheng Qingdong,et al.High electron mobility ZnO film for high-performance inverted polymer solar cells[J]. Applied Physics Letters,2015,106(16):163902.
[6] Kim Kun Ho,Gong Su Cheol,Chang Ho Jung. Effects of anode buffer layers on the properties of organic solar cells[J]. Thin Solid Films,2012,521:69—72.
[7] Lampande R,Kim Gyeong Woo,Boizot J,et al. A highly efficient transition metal oxide layer for hole extraction and transport in inverted polymer bulk heterojunction solar cells[J]. Journal of Materials Chemistry A,2013,1(23):6895—6900.
[8] Wang Guojie, Jiu Tonggang, Tang Gang, et al.Interface modification of ZnO-based inverted PTB7:PC71BM organic solar cells by cesium stearate and simultaneous enhancement of device parameters[J].ACS Sustainable Chemistry&Engineering,2014,2(5):1331—1337.
[9] Kim Yong Hyun,Sachse C,Machala M L,et al. Highly conductive PEDOT:PSS electrode with optimized solvent and thermal post-treatment for ITO-free organic solar cells[J]. Advanced Functional Materials,2011,21(6):1076—1081.
[10] Chu Chih Wei,Mengistie D A,Wang Peng Cheng.Effect of molecular weight of additives on the conductivity of PEDOT:PSS and efficiency for ITO-free organic solar cells[J]. Journal of Materials Chemistry A,2013,1(34):9907—9915.
[11] Tai Qidong,Li Jinhua,Liu Zhike,et al. Enhanced photovoltaic performance of polymer solar cells by adding fullerene end-capped polyethylene glycol[J].Journal of Materials Chemistry,2011,21(19):6848—6853.
[12] Kim Yong Hyun,Sachse C,Machala M L,et al. Highly conductive PEDOT:PSS electrode with optimized solvent and thermal post-treatment for ITO-free organic solar cells[J]. Advanced Functional Materials,2011,21(6):1076—1081.
[13] Li Xiong,Hu Yufeng,Deng Zhenbo,et al. Efficient polymer solar cells with polyethylene glycol cathode buffer layer and improved PEDOT:PSS conductivity[J]. Physica Status Solidi(A),2015,212(8):1800—1804.
[14] Lang U,Müller E,Naujoks N,et al. Microscopical investigations of PEDOT:PSS thin films[J]. Advanced Functional Materials,2009,19(8):1215—1220.
[15] Jia Tao, Han Jianxiong, Zhou Weilong, et al.Application of a water-soluble metallophthalocyanine derivative as a cathode interlayer for the polymer solar cells[J]. Solar Energy Materials and Solar Cells,2015,141:93—100.
[16] Zhou Huiqiong,Zhang Yuan,Seifter J,et al. Highefficiency polymer solar cells enhanced by solvent treatment[J]. Advanced Materials, 2013, 25(11):1646—1652.
[17] Cho Shinuk,Kim Kwang-Dae,Heo Jinhee,et al. Role of additional PCBM layer between ZnO and photoactive layers in inverted bulk-heterojunction solar cells[J].Scientific Reports,2014,4:4306.