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Transient photocurrent of bulk heterojunction solar cell characterized by ns-laser and sub-ms LED
Thammasat University, Thailand; Lund University, Sweden.
Lund University, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Lund University, Sweden.
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2015 (English)In: INTERNATIONAL CONFERENCE ON PHOTONICS SOLUTIONS 2015, SPIE-INT SOC OPTICAL ENGINEERING , 2015, Vol. 9659, no UNSP 96591CConference paper (Refereed)Text
Abstract [en]

We measure the transient photocurrent of APFO3:PCBM bulk heterojunction solar cells illuminated with ns-laser and sub-ms LED light sources. The ratio of the number of collective charges to the number of excited photon (external quantum efficiency, EQE) and the transient photocurrent fall times have been carried out with difference pulse durations and fluences. The EQEs characterized by ns-laser source are shown to obey the bimolecular recombination at high excitation fluences. The increasing of transient photocurrent fall times suggests that the fall times of free charge carriers are effected by deep trap density of state (DoS) and thus the free charge carriers have a sufficient time for bimolecular recombination at short circuit condition. At the same fluences, however, the EQEs characterized by sub-ms LED sources exhibit an excitation fluences independence of EQE. The transient photocurrent fall times with sub-ms LED sources are rather constant when the excitation fluences increases indicating that the deep trap DoS has less effect at short circuit condition for longer pulse duration.

Place, publisher, year, edition, pages
, Proceedings of SPIE, ISSN 0277-786X ; 9659
Keyword [en]
Transient photocurrent; Organic Solar Cells; Bulk heterojunction; APFO3
National Category
Biological Sciences
URN: urn:nbn:se:liu:diva-124148DOI: 10.1117/12.2195857ISI: 000366498800046ISBN: 978-1-62841-875-0OAI: diva2:896733
International Conference on Photonics Solutions (ICPS)
Available from: 2016-01-22 Created: 2016-01-19 Last updated: 2016-01-22

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Tang, ZhengInganäs, Olle
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Biomolecular and Organic ElectronicsFaculty of Science & Engineering
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