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Hybrid heterojunction solar cells using single-walled carbon nanotubes and amorphous silicon thin films

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Pramod, Mulbagal Rajanna
dc.date.accessioned 2020-05-13T09:00:08Z
dc.date.available 2020-05-13T09:00:08Z
dc.date.issued 2020
dc.identifier.isbn 978-952-60-3893-3 (electronic)
dc.identifier.isbn 978-952-60-3892-6 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/44179
dc.description The doctoral dissertation is conducted under a convention for the joint supervision of thesis at Aalto University (Finland) and Skolkovo Institute of Science and Technology (Russia) for the degree of Doctor of Science (Technology) at Aalto University. en
dc.description The public defense on 27th May 2020 at 17:00 (5 p.m.) will be organized via remote technology. Link: https://aalto.zoom.us/j/63096711658 Zoom Quick Guide: https://www.aalto.fi/en/services/zoom-quick-guide
dc.description.abstract Single-walled carbon nanotubes possess extraordinary optical, electrical, chemical, and mechanical properties. Thin films of randomly oriented SWCNTs have a great potential in many opto-electro-mechanical applications. Moreover, recent developments in photovoltaics have been largely contributed by SWCNTs as a p-type transparent conductor that fulfill the requirements for continuous, fast, and cheap film manufacturing process compatible with the roll-to-roll technology.  The scope of this thesis is the development of a conductive p-type SWCNT transparent conductor and its application in hybrid heterostructure solar cell based on amorphous silicon. For successful implementation of SWCNTs film in solar cells, it is very critical for the SWCNTs to have good physical contact with the material on which it is deposited. At first, quantitative measurements of the adhesion of SWCNT films with substrate materials in air and inert Ar atmosphere using atomic force microscopy was performed. It was found that adhesion of SWCNT films depends on the atmospheric conditions under which it is stored and deposited on a substrate material. The SWCNT film was measured to have higher adhesion in an inert atmosphere. With this understanding, a simple fabrication method of hybrid heterostructure solar cells was proposed in which the SWCNT-PEDOT:PSS composite p-type film forms a coupled continuous hybrid heterojunction with a-Si:H absorber. The optical and electrical properties of this composite was extensively characterized and further optimized by introducing multifunctional components like ultrathin MoO3 and SWCNT fibers. A rationally designed p-type transparent conductor with a combination of SWCNTs-MoO3-PEDOT:PSS-SWCNT fibers composite resulted in a state-of-the-art sheet resistance of 17 Ω/sq at 90% transmittance. Moreover, SWCNT fibers by itself can be used as replacement for traditional metal contacts as demonstrated here. This opens a new avenue in widespread energy technologies, where high hole conductivity and transparency of the material are prerequisites for their successful implementation.  Integrating the developed p-type transparent conductor as a window layer and top electrode on a-Si:H in a nip configuration resulted in a dramatic increase in its power conversion efficiency reaching up to 8.8%. The energy level alignment of these solar cells is carefully engineered at a-Si:H and SWCNTs interface by introducing a ultrathin MoO3 layer that shows the carrier transport by means of band-to-band or trap-assisted tunneling. en
dc.format.extent 76 + app. 67
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 79/2020
dc.relation.haspart [Publication 1]: Pramod M. Rajanna, Sergey Luchkin, Konstantin V. Larionov, Artem Grebenko, Zakhar I. Popov, Pavel B. Sorokin, Mati Danilson, Sergei Bereznev, Peter D. Lund, and Albert G. Nasibulin. Adhesion of Single-Walled Carbon Nanotube Thin Films with Different Materials. J. Phys. Chem. Lett. 2020, 11, 504−509. DOI: 10.1021/acs.jpclett.9b03552
dc.relation.haspart [Publication 2]: Pramod M Rajanna, Evgenia P Gilshteyn, Timur Yagafarov, Alena K Aleekseeva, Anton S Anisimov, Alex Neumüller, Oleg Sergeev, Sergei Bereznev, Jelena Maricheva, and Albert G Nasibulin. Enhanced efficiency of hybrid amorphous silicon solar cells based on single-walled carbon nanotubes and polymer composite thin film. Nanotechnology 29 (2018) 105404 (10 pp). DOI: 10.1088/1361-6528/aaa647
dc.relation.haspart [Publication 3]: Alena K. Alekseeva, Pramod Mulbagal Rajanna, Anton S. Anisimov, Oleg Sergeev, Sergei Bereznev, and Albert G. Nasibulin. Synergistic Effect of Single-Walled Carbon Nanotubes and PEDOT:PSS in Thin Film Amorphous Silicon Hybrid Solar Cell. Phys. Status Solidi B 2018, 255, 1700557. DOI: 10.1002/pssb.201700557
dc.relation.haspart [Publication 4]: Pramod M. Rajanna, Hosni Meddeb, Oleg Sergeev, Alexey P. Tsapenko, Sergei Bereznev, Martin Vehse, Olga Volobujeva, Mati Danilson, Peter D. Lund, Albert G. Nasibulin. Rational design of highly efficient flexible and transparent p-type composite electrode based on single-walled carbon nanotubes. Nano Energy 67 (2020) 104183. DOI: 10.1016/j.nanoen.2019.104183
dc.relation.haspart [Publication 5]: Pramod M. Rajanna, Peter D. Lund, Albert G. Nasibulin. Hybrid hetero-junction solar cells based on single-walled carbon nanotubes and amorphous silicon thin film - a mini review. Submitted, May 2020.
dc.subject.other Energy en
dc.subject.other Physics en
dc.title Hybrid heterojunction solar cells using single-walled carbon nanotubes and amorphous silicon thin films en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Perustieteiden korkeakoulu fi
dc.contributor.school School of Science en
dc.contributor.department Teknillisen fysiikan laitos fi
dc.contributor.department Department of Applied Physics en
dc.subject.keyword single-walled carbon nanotubes en
dc.subject.keyword amorphous silicon en
dc.subject.keyword hybrid en
dc.subject.keyword heterojunction en
dc.subject.keyword thin en
dc.subject.keyword films en
dc.subject.keyword solar cells en
dc.identifier.urn URN:ISBN:978-952-60-3893-3
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Lund, Peter D., Prof., Aalto University, Department of Applied Physics, Finland
dc.contributor.supervisor Nasibulin, Albert G., Prof., Skolkovo Institute of Science and Technology, Russia
dc.opn Zakhidov, Anvar, Prof., University of Texas at Dallas, USA
dc.contributor.lab New Energy Technologies (Aalto University) and Laboratory of Nanomaterials (Skoltech) en
dc.rev di Carlo, Aldo, Prof., University of Rome, Italy
dc.date.defence 2020-05-27
local.aalto.acrisexportstatus checked 2020-06-23_2028
local.aalto.infra OtaNano
local.aalto.infra OtaNano - Nanomicroscopy Center
local.aalto.formfolder 2020_05_13_klo_11_19
local.aalto.archive yes

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