Incorporation of liquid crystalline triphenylene derivative in bulk heterojunction solar cell with molybdenum oxide as buffer layer for improved efficiency |
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| Authors: | Manisha Bajpai Neelam Yadav Sandeep Kumar Ritu Srivastava |
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| Institution: | 1. Centre of Material Sciences, Institute of Interdisciplinary Studies, University of Allahabad, Allahabad, India;2. Soft Condensed Matter Group, Raman Research Institute, Bangalore, India;3. Physics for Energy Harvesting Division, National Physical Laboratory, New Delhi, India |
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| Abstract: | We report efficient bulk heterojunction solar cells fabricated by inserting a discotic triphenylene derivative into poly (3-hexylthiophene): 6, 6]- phenyl-C61-butyric acid methyl ester. A layer of molybdenum oxide was inserted between anode and active layer. Power conversion efficiency of 2.0% was achieved for these photovoltaic solar cells containing self-organised discotic liquid crystals in the active layer under one sun condition. The influence of varying the thickness of liquid crystal layer and annealing on these solar cells was also studied. Post annealing the bulk heterojunction devices with discotic liquid crystal layer of thickness 20 nm in them yielded an open circuit voltage of 0.41 V, short circuit current density of 17.0 mA cm?2, a Fill factor of 0.35 and power conversion efficiency of 2.5%. |
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| Keywords: | Discotic liquid crystal bulk heterojunction optical band gap annealing current density |
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