Application of benzodithiophene based A-D-A structured materials in efficient perovskite solar cells and organic solar cells
2016 (English)In: Nano Energy, ISSN 2211-2855, Vol. 23, 40-49 p.Article in journal (Refereed) PublishedText
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.
Perovskite solar cells, Dopant-free, Hole transport material, Organic solar cells, Donor material
IdentifiersURN: urn:nbn:se:kth:diva-187795DOI: 10.1016/j.nanoen.2016.03.007ISI: 000375045900006OAI: oai:DiVA.org:kth-187795DiVA: diva2:932059
FunderSwedish Energy AgencySwedish Research CouncilKnut and Alice Wallenberg Foundation
QC 201605312016-05-312016-05-302016-05-31Bibliographically approved