Boosting inverted perovskite solar cell performance by using 9, 9-bis(4-diphenylaminophenyl)fluorene functionalized with triphenylamine as a dopant-free hole transporting material. Issue 20 (9th May 2019)

• Record Type: Journal Article
• Authors: Pham, Hong Duc; Gil-Escrig, Lidón; Feron, Krishna; Manzhos, Sergei; Albrecht, Steve; Bolink, Henk J.; Sonar, Prashant
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 20(2019)
• Page Start: 12507
• Page End: 12517
• Publication Date: 2019-05-09
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta01681c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : New small molecules based on 9, 9-bis(4-diphenylaminophenyl)fluorene functionalized with triphenylamine moieties are developed for use as dopant-free hole transporting materials (HTMs) in planar inverted perovskite solar cells. Power conversion efficiencies (PCE) as high as 17.1% are obtained with good stability. Abstract : In this study, two newly developed small molecules based on 9, 9-bis(4-diphenylaminophenyl)fluorene functionalized with triphenylamine moieties, namelyTPA-2, 7-FLTPA-TPA andTPA-3, 6-FLTPA-TPA, are designed, synthesized and characterized. The electrochemical, optical and thermal properties of both materials are investigated using various techniques. Afterwards, these materials are employed as dopant-free hole transporting materials (HTMs) in planar inverted perovskite solar cell devices with the aim of determining the device performance and studying their stability in comparison with reference N 4, N 4, N 4 ′′, N 4 ′′-tetra([1, 10-biphenyl]-4-yl)-[1, 1′:4′, 1′′-terphenyl]-4, 4′′-diamine (TaTm)-based devices. Under 1 sun conditions, TPA-3, 6-FLTPA-TPA -based devices achieve a power conversion efficiency (PCE) of 13.9% whereasTPA-2, 7-FLTPA-TPA -based devices exhibit the highest PCE of 17.1% mainly due to an improvement in the fill factor (FF). Meanwhile, the devices prepared using TaTm as the reference HTM exhibit an overall efficiency of 15.9%. In addition to the higher efficiency, our newly developed HTMTPA-2, 7-FLTPA-TPA -based devices demonstrate good stability which is comparable to those with TaTm under similar aging test conditions.