Remarkably High Conversion Efficiency of Inverted Bulk Heterojunction Solar Cells: From Ultrafast Laser Spectroscopy and Electron Microscopy to Device Fabrication and Optimization

Handle URI:
http://hdl.handle.net/10754/621789
Title:
Remarkably High Conversion Efficiency of Inverted Bulk Heterojunction Solar Cells: From Ultrafast Laser Spectroscopy and Electron Microscopy to Device Fabrication and Optimization
Authors:
Alsulami, Qana ( 0000-0001-5481-5414 ) ; Banavoth, Murali ( 0000-0002-7806-2274 ) ; Alsinan, Yara; Parida, Manas R.; Aly, Shawkat Mohammede ( 0000-0002-0455-1892 ) ; Mohammed, Omar F. ( 0000-0001-8500-1130 )
Abstract:
In organic donor-acceptor systems, ultrafast interfacial charge transfer (CT), charge separation (CS), and charge recombination (CR) are key determinants of the overall performance of photovoltaic devices. However, a profound understanding of these photophysical processes at device interfaces remains superficial, creating a major bottleneck that circumvents advancements and the optimization of these solar cells. Here, results from time-resolved laser spectroscopy and high-resolution electron microscopy are examined to provide the fundamental information necessary to fabricate and optimize organic solar cell devices. In real time, CT and CS are monitored at the interface between three fullerene acceptors (FAs) (PC71BM, PC61BM, and IC60BA) and the PTB7-Th donor polymer. Femtosecond transient absorption (fs-TA) data demonstrates that photoinduced electron transfer from the PTB7-Th polymer to each FA occurs on the sub-picosecond time scale, leading to the formation of long-lived radical ions. It is also found that the power conversion efficiency improves from 2% in IC60BA-based solar cells to >9% in PC71BM-based devices, in support of our time-resolved results. The insights reported in this manuscript provide a clear understanding of the key variables involved at the device interface, paving the way for the exploitation of efficient CS and subsequently improving the photoconversion efficiency. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
KAUST Department:
Solar and Photovoltaic Engineering Research Center (SPERC)
Citation:
Alsulami QA, Murali B, Alsinan Y, Parida MR, Aly SM, et al. (2016) Remarkably High Conversion Efficiency of Inverted Bulk Heterojunction Solar Cells: From Ultrafast Laser Spectroscopy and Electron Microscopy to Device Fabrication and Optimization. Adv Energy Mater 6: 1502356. Available: http://dx.doi.org/10.1002/aenm.201502356.
Publisher:
Wiley-Blackwell
Journal:
Advanced Energy Materials
Issue Date:
10-Apr-2016
DOI:
10.1002/aenm.201502356
Type:
Article
ISSN:
1614-6832
Sponsors:
Q.A. and B.M. contributed equally to this work. The authors gratefully acknowledge the funding support from KAUST.
Appears in Collections:
Articles; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorAlsulami, Qanaen
dc.contributor.authorBanavoth, Muralien
dc.contributor.authorAlsinan, Yaraen
dc.contributor.authorParida, Manas R.en
dc.contributor.authorAly, Shawkat Mohammedeen
dc.contributor.authorMohammed, Omar F.en
dc.date.accessioned2016-11-03T13:25:01Z-
dc.date.available2016-11-03T13:25:01Z-
dc.date.issued2016-04-10en
dc.identifier.citationAlsulami QA, Murali B, Alsinan Y, Parida MR, Aly SM, et al. (2016) Remarkably High Conversion Efficiency of Inverted Bulk Heterojunction Solar Cells: From Ultrafast Laser Spectroscopy and Electron Microscopy to Device Fabrication and Optimization. Adv Energy Mater 6: 1502356. Available: http://dx.doi.org/10.1002/aenm.201502356.en
dc.identifier.issn1614-6832en
dc.identifier.doi10.1002/aenm.201502356en
dc.identifier.urihttp://hdl.handle.net/10754/621789-
dc.description.abstractIn organic donor-acceptor systems, ultrafast interfacial charge transfer (CT), charge separation (CS), and charge recombination (CR) are key determinants of the overall performance of photovoltaic devices. However, a profound understanding of these photophysical processes at device interfaces remains superficial, creating a major bottleneck that circumvents advancements and the optimization of these solar cells. Here, results from time-resolved laser spectroscopy and high-resolution electron microscopy are examined to provide the fundamental information necessary to fabricate and optimize organic solar cell devices. In real time, CT and CS are monitored at the interface between three fullerene acceptors (FAs) (PC71BM, PC61BM, and IC60BA) and the PTB7-Th donor polymer. Femtosecond transient absorption (fs-TA) data demonstrates that photoinduced electron transfer from the PTB7-Th polymer to each FA occurs on the sub-picosecond time scale, leading to the formation of long-lived radical ions. It is also found that the power conversion efficiency improves from 2% in IC60BA-based solar cells to >9% in PC71BM-based devices, in support of our time-resolved results. The insights reported in this manuscript provide a clear understanding of the key variables involved at the device interface, paving the way for the exploitation of efficient CS and subsequently improving the photoconversion efficiency. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.en
dc.description.sponsorshipQ.A. and B.M. contributed equally to this work. The authors gratefully acknowledge the funding support from KAUST.en
dc.publisherWiley-Blackwellen
dc.subjectBulk heterojunctionen
dc.subjectGrain alignmenten
dc.subjectHigh-resolution electron microscopyen
dc.subjectInterfacial charge transferen
dc.subjectLaser spectroscopyen
dc.subjectSolar cellsen
dc.titleRemarkably High Conversion Efficiency of Inverted Bulk Heterojunction Solar Cells: From Ultrafast Laser Spectroscopy and Electron Microscopy to Device Fabrication and Optimizationen
dc.typeArticleen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.identifier.journalAdvanced Energy Materialsen
kaust.authorAlsulami, Qanaen
kaust.authorBanavoth, Muralien
kaust.authorAlsinan, Yaraen
kaust.authorParida, Manas R.en
kaust.authorAly, Shawkat Mohammedeen
kaust.authorMohammed, Omar F.en
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