Dithiapyrannylidenes as Efficient Hole Collection Interfacial Layers in Organic Solar Cells

被引:34
|
作者
Berny, Stephane [1 ,2 ]
Tortech, Ludovic [1 ,2 ]
Veber, Michelle [3 ]
Fichou, Denis [1 ,2 ]
机构
[1] CEA Saclay, Organ Nanostruct & Semicond Grp, SPCSI, IRAMIS, F-91191 Gif Sur Yvette, France
[2] UPMC, IPCM, UMR 7201, CNRS, F-75005 Paris, France
[3] Univ Paris 11, CNRS, UMR 8502, F-91405 Orsay, France
关键词
organic solar cells; photovoltaic devices; interfacial layers; current-sensing atomic force microscopy; space-charge-limited current; PHOTOCURRENT GENERATION; INJECTION; POLYMER; FILMS; ANODE; TRANSPORT; LIGHT; MORPHOLOGY; OXIDE;
D O I
10.1021/am1005546
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
One inherent limitation to the efficiency of photovoltaic solar cells based on polymer/fullerene bulk heterojunctions (BHJs) is the accumulation of positive charges at the anodic interface. The unsymmetrical charge collection of holes and electrons dramatically decreases the short-circuit current. Interfacial layers (IFLs) such as poly (3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) have no effect on the unbalanced electron/hole transport across the BHJ. We report here on the use of dithiapyrannylidenes (DITPY), a new class of planar quinoid compounds, as efficient hole-transporting/electron-blocking layers in organic solar cells based on poly(3- hexylthiophene)/[6,6]-phenyl-C-61-butyric acid methyl ester (P3HT:PCBM) BHJs. Inserting a 15-nm-thick IFL of 4,4'-bis(diphenyl-2,6- thiapyrannylidene) (DITPY-Ph-4) between the indium-tin oxide electrode and the P3HT:PCBM BHJ prevents detrimental space charge effects and favors recombination limited currents. Current-sensing atomic force microscopy reveals a drastic increase of the hole-carrying pathways in DITPY-Ph-4 compared to PEDOT-PSS. In ambient conditions photovoltaic cells using DITPY-Ph-4 exhibit an 8% increase in the current density although the conversion efficiency remains slightly lower compared to PEDOT:PSS-based devices. Finally, we represent a detailed analysis of the photocurrent generation, showing that DITPY-Ph-4 IFLs induce a transition from unproductive space-charge-limited currents to recombination-limited currents.
引用
收藏
页码:3059 / 3068
页数:10
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