Transparent back contacts for P3HT:PCBM bulk heterojunction solar cells

18th International Summer School on Vacuum, Electron and Ion Technologies

Sendova-Vassileva, M.^1 ; Dikov, H.^1 ; Popkirov, G.^1 ; Lazarova, E.^1 ; Gancheva, V.^2 ; Grancharov, G.^2 ; Tsocheva, D.^2 ; Mokreva, P.^2 ; Vitanov, P.^1

Central Laboratory of Solar Energy and New Energy Sources, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria^1

Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 103-A, 1113 Sofia, Bulgaria^2

关键词: Bulk heterojunction;    Bulk heterojunction solar cells;    Current voltage;    Electrical characteristic;    Electrical conductivity;    Optical transparency;    Thin metal layers;    Transparent back contact;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/514/1/012018/pdf
DOI  :  10.1088/1742-6596/514/1/012018

来源: IOP

【 摘 要 】

A new combination of layers functioning as a transparent contact is proposed and tested in real solar cells. The contacts consist of TiO2 layers and thin metal layers (Ag, Cu) and are deposited by magnetron sputtering. The optical transmission and electrical conductivity of the transparent contact layers (TCL) are measured. The TCLs are applied as back contacts in bulk heterojunction polymer solar cells deposited on ITO covered glass and consisting of the following layers: ITO/PEDOT:PSS/P3HT:PCBM/back contact. The organic layers are deposited by spin-coating. For comparison, the same bulk heterojunction polymer solar cells are prepared with a sputtered Ag back contact. The first results show a dependence of the current-voltage parameters of the studied solar cells on the thickness of the different component layers of the transparent back contacts. There is a balance that has to be observed between the electrical characteristics of the contacts and their optical transparency. Future plans involve their inclusion as intermediate contacts in tandem organic solar cells.