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A novel phenoxazine-based hole transport material for efficient perovskite solar cell
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
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2015 (English)In: Journal of Energy Challenges and Mechanics, ISSN 2095-4956, E-ISSN 2056-9386, Vol. 24, no 6, 698-706 p.Article in journal (Refereed) PublishedText
Abstract [en]

Based on the previous research work in our laboratory, we have designed and synthesized a small-molecule, hole transport material (HTM) POZ6-2 using phenoxazine (POZ) as central unit and dicyanovinyl units as electron-withdrawing terminal groups. Through the introduction of a 2-ethyl-hexyl bulky chain into the POZ core unit, POZ6-2 exhibits good solubility in organic solvents. In addition, POZ6-2 possesses appropriate energy levels in combination with a high hole mobility and conductivity in its pristine form. Therefore, it can readily be used as a dopant-free HTM in perovskite solar cells (PSCs) and a conversion efficiency of 10.3% was obtained. The conductivity of the POZ6-2 layer can be markedly enhanced via doping in combination with typical additives, such as 4-tert-butylpyridine (TBP) and lithium bis(trifluoromethanesulfonyl) imide (LiTFSI). Correspondingly, the efficiency of the PSCs was further improved to 12.3% using doping strategies. Under the same conditions, reference devices based on the well-known HTM Spiro-OMeTAD show an efficiency of 12.8%.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 24, no 6, 698-706 p.
Keyword [en]
Dopant-free, Perovskite solar cell, Hole transport material, Phenoxazine, Thin film
National Category
Physical Sciences Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-180515DOI: 10.1016/j.jechem.2015.10.021ISI: 000366542300005ScopusID: 2-s2.0-84948682610OAI: oai:DiVA.org:kth-180515DiVA: diva2:894558
Note

QC 20160115

Available from: 2016-01-15 Created: 2016-01-14 Last updated: 2016-01-15Bibliographically approved

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Cheng, MingXu, BoHua, YongKloo, LarsSun, Licheng
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