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Application of benzodithiophene based A-D-A structured materials in efficient perovskite solar cells and organic solar cells
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, Applied Physical Chemistry.ORCID iD: 0000-0001-5069-3245
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0001-5115-4593
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2016 (English)In: Nano Energy, ISSN 2211-2855, Vol. 23, 40-49 p.Article in journal (Refereed) PublishedText
Abstract [en]

In this work, we have designed and synthesized a novel molecular material, BDT-C1, in which the core unit, benzodithiophene (BDT), was functionalized by thiophene (TP) and benzo-[c][1,2,5]-thiadiazole (BTZ) derivatives to generate extended pi-conjugation. BDT-C1 shows high hole mobility and high conductivity in its pristine form, in combination with appropriate energy level alignment with respect to [CH3NH3]PbI3 and PC70BM, qualifying the material as a good candidate for application both in perovskite solar cells (PSCs) as dopant-free hole transport material (HTM) and in OSCs as donor material. The champion PSCs based on BDT-C1 show an average conversion efficiency (PCE) of 13.4% (scan forward: 13.9%; scan backward: PCE=12.9%, scan rate: 10 mV/s). Although the average efficiency obtained is slightly lower than that of reference devices based on the well-known doped HTM Spiro-OMeTAD (13.7%), the BDT-C1 based devices exhibit better stability. Moreover, BDT-C1 as a donor material in OSCs also shows good performance in combination with PC70BM as acceptor material, and an efficiency of 6.1% was obtained. The present results demonstrate that BDT-C1 works well as both donor material in OSCs as well as dopant-free HTMs for efficient PSCs.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 23, 40-49 p.
Keyword [en]
Perovskite solar cells, Dopant-free, Hole transport material, Organic solar cells, Donor material
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-187795DOI: 10.1016/j.nanoen.2016.03.007ISI: 000375045900006OAI: oai:DiVA.org:kth-187795DiVA: diva2:932059
Funder
Swedish Energy AgencySwedish Research CouncilKnut and Alice Wallenberg Foundation
Note

QC 20160531

Available from: 2016-05-31 Created: 2016-05-30 Last updated: 2016-05-31Bibliographically approved

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Cheng, MingLiu, PengGao, JiajiaKloo, LarsSun, Licheng
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Applied Physical ChemistryOrganic ChemistryZhejiang-KTH Joint Research Center of Photonics, JORCEP
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