A new method to improve the lifetime stability of small molecule bilayer heterojunction organic solar cells

被引:18
作者
AL-Amar, Mohammad M. [1 ]
Hamam, Khalil J. [1 ]
Mezei, Gellert [2 ]
Guda, Ramakrishna [2 ]
Hamdan, Nasser M. [3 ]
Burns, Clement A. [1 ]
机构
[1] Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA
[2] Western Michigan Univ, Dept Chem, Kalamazoo, MI 49008 USA
[3] Amer Univ Sharjah, Dept Phys, Sharjah, U Arab Emirates
关键词
Organic photovoltaics; Small molecule solar cells; Carboxylated copper phthalocyanine; Stability; Unencapsulated solar cells; LARGE-AREA; PHTHALOCYANINE; PHOTOVOLTAICS; DEGRADATION; INTERFACE; MODULES; FILMS;
D O I
10.1016/j.solmat.2012.11.006
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Unencapsulated small molecular solar cells with a layer of carboxylated copper phthalocyanine (CuPc*) introduced between the donor copper phthalocyanine (CuPc) and acceptor 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDI), and using ITO and Ag as the cathode and anode were investigated for 35 days. The performance and stability were compared between traditional ITO/PEDOT:PSS/CuPc/PTCDI/Ag cells and the new ITO/PEDOT:PSS/CuPc/CuPc*/PTCDI/Ag cells. The comparison shows that the modified cell has an enhanced stability compared to traditional cells. The improvement of the lifetime is likely due to the CuPc* layer working as buffer layer to prevent humidity and oxygen from diffusing into the active layer. Different thicknesses of CuPc were investigated to study the effects of CuPc layer thickness on the electrical properties of these devices. It was found that the properties of the cell with 20 nm thickness of CuPc were the best. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:270 / 274
页数:5
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