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Chin. Phys. B, 2020, Vol. 29(9): 098801    DOI: 10.1088/1674-1056/aba5fc
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

Temperature-dependent barrier height inhomogeneities in PTB7:PC71BM-based organic solar cells

Brahim Ait Ali1,2, Reda Moubah2, Abdelkader Boulezhar1, Hassan Lassri2
1 LERDyS, Faculty of Science Ain Chock, Hassan II University of Casablanca, Morocco;
2 LPMMAT, Faculty of Science Ain Chock, Hassan II University of Casablanca, Morocco
Abstract  We report on the temperature-dependent Schottky barrier in organic solar cells based on PTB7:PC71BM. The ideality factor is found to increase with temperature decreasing, which is explained by a model in which the solar cell is taken as Schottky barrier diode. Accordingly, the dark current in the device originates from the thermally emitted electrons across the Schottky barrier. The fittings obtained with the thermal emission theory are systematically studied at different temperatures. It is concluded that the blend/Ca/Al interface presents great inhomogeneity, which can be described by 2 sets of Gaussian distributions with large zero bias standard deviations. With the decrease of temperature, electrons favor going across the Schottky barrier patches with lower barrier height and as a consequence the ideally factor significantly increases at low temperature.
Keywords:  organic materials      photovoltaics      Schottky barrier      barrier height  
Received:  16 December 2019      Revised:  16 June 2020      Published:  05 September 2020
PACS:  88.40.jr (Organic photovoltaics)  
  78.55.Kz (Solid organic materials)  
  73.30.+y (Surface double layers, Schottky barriers, and work functions)  
  33.15.Hp (Barrier heights (internal rotation, inversion, rotational isomerism, conformational dynamics))  
Corresponding Authors:  Reda Moubah     E-mail:  reda.moubah@hotmail.fr

Cite this article: 

Brahim Ait Ali, Reda Moubah, Abdelkader Boulezhar, Hassan Lassri Temperature-dependent barrier height inhomogeneities in PTB7:PC71BM-based organic solar cells 2020 Chin. Phys. B 29 098801

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