3 years ago

Amphiphilic Diblock Fullerene Derivatives as Cathode Interfacial Layers for Organic Solar Cells

Amphiphilic
Diblock Fullerene Derivatives as Cathode Interfacial Layers for Organic
Solar Cells
Fu Li, Junli Li, Xiangfu Liu, Guoli Tu, Jikang Liu
A new amphiphilic diblock fullerene derivative [6,6]-phenyl-C61-butyricacid-4-(9,9,9′,9′-tetrakis(3-bromopropyl)-9H,9′H-[2,2′-bifluoren]-7-yl)phenol-(N,N,N-trimethylpropan-1-aminium) bromide (C60-4TPB) was synthesized and applied in organic solar cells. Solvent annealing by toluene could obviously induce the self-assembly of the C60-4TPB layer, which can be tested by the measurements of the water contact angle. After the treatment with toluene, a vertical-like arrangement in the ultrathin layer of the C60-4TPB molecule will be formed between electron-collecting zinc oxide (ZnO) layers and the active layer (blend system of PTB7:PC71BM), leading to the improvement of the interfacial compatibility between the active layer and the ZnO layer. On the top surface of the C60-4TPB layer, the C60 molecules can be expected to induce the enrichment of PC71BM and block the hole, resulting in further increase in the open-circuit voltage (VOC) and fill factor (FF). After spin-coating the C60-4TPB solutions onto the ZnO layer with a concentration of 0.5 mg/mL in dimethyl sulfoxide, obviously improved performances were obtained with a power conversion efficiency of 8.07%, which can be attributed to the optimized interface morphology between hydrophilic ZnO and hydrophobic PTB7:PC71BM.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b18331

DOI: 10.1021/acsami.7b18331

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