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Chin. Phys. B, 2017, Vol. 26(9): 097203    DOI: 10.1088/1674-1056/26/9/097203
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Inverted organic solar cells with solvothermal synthesized vanadium-doped TiO2 thin films as efficient electron transport layer

Mehdi Ahmadi, Sajjad Rashidi Dafeh, Samaneh Ghazanfarpour, Mohammad Khanzadeh
Department of Physics, Faculty of Science, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
Abstract  We investigated the effects of using different thicknesses of pure and vanadium-doped thin films of TiO2 as the electron transport layer in the inverted configuration of organic photovoltaic cells based on poly (3-hexylthiophene) P3HT: [6-6] phenyl-(6) butyric acid methyl ester (PCBM). 1% vanadium-doped TiO2 nanoparticles were synthesized via the solvothermal method. Crystalline structure, morphology, and optical properties of pure and vanadium-doped TiO2 thin films were studied by different techniques such as x-ray diffraction, scanning electron microscopy, transmittance electron microscopy, and UV-visible transmission spectrum. The doctor blade method which is compatible with roll-2-roll printing was used for deposition of pure and vanadium-doped TiO2 thin films with thicknesses of 30 nm and 60 nm. The final results revealed that the best thickness of TiO2 thin films for our fabricated cells was 30 nm. The cell with vanadium-doped TiO2 thin film showed slightly higher power conversion efficiency and great Jsc of 10.7 mA/cm2 compared with its pure counterpart. In the cells using 60 nm pure and vanadium-doped TiO2 layers, the cell using the doped layer showed much higher efficiency. It is remarkable that the external quantum efficiency of vanadium-doped TiO2 thin film was better in all wavelengths.
Keywords:  inverted polymer solar cells      electron transport layer      vanadium-doped TiO2 thin films      solvothermal  
Received:  12 March 2017      Revised:  13 May 2017      Accepted manuscript online: 
PACS:  72.80.Le (Polymers; organic compounds (including organic semiconductors))  
  73.61.-r (Electrical properties of specific thin films)  
  73.22.-f (Electronic structure of nanoscale materials and related systems)  
Corresponding Authors:  Mehdi Ahmadi     E-mail:  m.ahmadi@vru.ac.ir

Cite this article: 

Mehdi Ahmadi, Sajjad Rashidi Dafeh, Samaneh Ghazanfarpour, Mohammad Khanzadeh Inverted organic solar cells with solvothermal synthesized vanadium-doped TiO2 thin films as efficient electron transport layer 2017 Chin. Phys. B 26 097203

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