All-small molecule solar cells based on donor molecule optimization with highly enhanced efficiency and stability. Issue 32 (30th July 2018)

• Record Type: Journal Article
• Authors: Guo, Jie; Bin, Haijun; Wang, Wei; Chen, Bingcai; Guo, Jing; Sun, Rui; Zhang, Zhi-Guo; Jiao, Xuechen; Li, Yongfang; Min, Jie
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 32(2018)
• Page Start: 15675
• Page End: 15683
• Publication Date: 2018-07-30
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta02778a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A small molecule donor BDT(TVT-SR)2 is developed and used in all-small molecule solar cells, and it exhibited a power conversion efficiency of 11.1% for BDT(TVT-SR)2 :IDIC solar cells, and good device stability. Abstract : In this work, a novel oligomer based on the introduction of alkylthio-thienylenevinylene thiophene (TVT-SR) side groups into benzo[1, 2- b :4, 5- b ′]dithiophene (BDT) as a central donor unit, BDT(TVT-SR)2, is developed and used as the donor material for all-small molecule OSCs (SM-OSCs) with IDIC as the acceptor. BDT(TVT-SR)2 exhibits red-shifted absorption, a down-shifted HOMO energy level and higher hole mobility in comparison with its corresponding molecule H11 with alkylthiothienyl side chains. The power conversion efficiency (PCE) of the SM-OSCs based on BDT(TVT-SR)2 :IDIC with thermal annealing (TA) at 110 °C for 10 min reached 11.1%. This TA treatment improves the film morphology, charge transport properties and thus device performance of the SM-OSCs. Besides, these devices show good morphological stability and photo-stability.