Issue 18, 2019

Low cost triazatruxene hole transporting material for >20% efficiency perovskite solar cells

Abstract

Organic hole-transporting materials (HTM) have shown excellent ability in achieving high efficiency perovskite solar cells. However, their high cost significantly limits their applications in scaling-up perovskite solar cells. Here, we report an efficient, low-cost HTM, called TAT-tBuSty, comprising a central triazatruxene moiety with 3 terminal tert-butoxy styrene groups and 3 hexyl side chains on the indole nitrogen. For the first time, we use an inexpensive liquid precursor to attach the donor ligand to the molecule. This enables purification of the HTM using a silica plug and recrystallization without the need for complicated column chromatography, which is typically required to purify solid-precursor-prepared HTMs. We estimate that the cost for the purified TAT-tBuSty is $69.90 g−1, which is 35% cheaper than the widely-used 2,2′7,7′-tetrakis-(N,N-di-p-methoxyphenyl-amine)-9,9′-spirobifluorene (spiro-OMeTAD; ca. $112.05 g−1). Using this low-cost TAT-tBuSty as the HTM in a caesium-formamidinium mixed-cation perovskite solar cell, we have successfully achieved a champion power conversion efficiency (PCE) of 20.3% (19.4% stabilized efficiency), which is comparable to the efficiency of devices using the reference spiro-OMeTAD HTM. Our work is crucial for up-scaling of next-generation high-performance metal-halide perovskite solar cells.

Graphical abstract: Low cost triazatruxene hole transporting material for >20% efficiency perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
23 Aug. 2018
Accepted
07 Nov. 2018
First published
15 Nov. 2018

J. Mater. Chem. C, 2019,7, 5235-5243

Low cost triazatruxene hole transporting material for >20% efficiency perovskite solar cells

A. Connell, Z. Wang, Y. Lin, P. C. Greenwood, A. A. Wiles, E. W. Jones, L. Furnell, R. Anthony, C. P. Kershaw, G. Cooke, H. J. Snaith and P. J. Holliman, J. Mater. Chem. C, 2019, 7, 5235 DOI: 10.1039/C8TC04231D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements