Eur. Phys. J. Appl. Phys.
Volume 74, Number 2, May 2016
Materials for Energy Harvesting, Conversion and Storage (ICOME 2015)
|Number of page(s)||6|
|Section||Physics of Organic Materials and Devices|
|Published online||03 May 2016|
Improvement of pentathiophene/fullerene planar heterojunction photovoltaic cells by improving the organic films morphology through the anode buffer bilayer*
Université de Nantes, MOLTECH-Anjou, CNRS, UMR 6200, 2 rue de la Houssinière, BP 92208, 44000 Nantes, France
2 LOPCM, Université Ibn Tofail, Faculté des Sciences, BP 133, 14000 Kenitra, Morocco
3 Université de Nantes, Institut des Matériaux Jean Rouxel (IMN), CNRS, UMR 6502, 2 rue de la Houssinière, BP 92208, 44000 Nantes, France
4 Departamento de Ciencia de los Materiales, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, 2777 Casilla, Santiago, Chile
5 Laboratory for Molecular Photonics and Electronics, Department of Physics, National Institute of Technology, 673 601 Calicut, Kerala, India
a e-mail: firstname.lastname@example.org
Revised: 24 July 2015
Accepted: 23 September 2015
Published online: 3 May 2016
Organic photovoltaic cells (OPVCs) are based on a heterojunction electron donor (ED)/electron acceptor (EA). In the present work, the electron donor which is also the absorber of light is pentathiophene. The typical cells were ITO/HTL/pentathiophene/fullerene/Alq3/Al with HTL (hole transport layer) = MoO3, CuI, MoO3/CuI. After optimisation of the pentathiophene thickness, 70 nm, the highest efficiency, 0.81%, is obtained with the bilayer MoO3/CuI as HTL. In order to understand these results the pentathiophene films deposited onto the different HTLs were characterized by scanning electron microscopy, atomic force microscopy, X-rays diffraction, optical absorption and electrical characterization. It is shown that CuI improves the conductivity of the pentathiophene layer through the modification of the film structure, while MoO3 decreases the leakage current. Using the bilayer MoO3/CuI allows cumulating the advantages of each layer.
© EDP Sciences, 2016
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