Document Type

Journal Article

Department/Unit

Department of Chemistry; Office of the Vice-President (Research and Development)

Title

Study of arylamine-substituted porphyrins as hole-transporting materials in high-performance perovskite solar cells

Language

English

Abstract

To develop new hole-transporting materials (HTMs) for efficient and stable perovskite solar cells (PSCs), 5,10,15,20-tetrakis{4-[N,N-di(4-methoxylphenyl)amino-phenyl]}-porphyrin was prepared in gram scale through the direct condensation of pyrrole and 4-[bis(4-methoxyphenyl)amino]benzaldehyde. Its Zn(II) and Cu(II) complexes exhibit excellent thermal and electrochemical stability, specifically a high hole mobility and very favorable energetics for hole extraction that render them a new class of HTMs in organometallic halide PSCs. As expected, ZnP as HTM in PSCs affords a competitive power conversion efficiency (PCE) of 17.78%, which is comparable to that of the most powerful HTM of Spiro-MeOTAD (18.59%) under the same working conditions. Meanwhile, the metal centers affect somewhat the photovoltaic performances that CuPas HTM produces a lower PCE of 15.36%. Notably, the PSCs employing ZnP show a much better stability than Spiro-OMeTAD. Moreover, the two porphyrin-based HTMs can be prepared from relatively cheap raw materials with a facile synthetic route. The results demonstrate that ZnP and CuP can be a new class of HTMs for efficient and stable PSCs. To the best of our knowledge, this is the best performance that porphyrin-based solar cells could show with PCE > 17%.

Keywords

arylamine substituents, hole mobility, hole-transporting material, perovskite solar cells, porphyrin

Publication Date

3-2017

Source Publication Title

ACS Applied Materials and Interfaces

Volume

9

Issue

15

Start Page

13231

End Page

13239

Publisher

American Chemical Society

Peer Reviewed

1

Copyright

© 2017 American Chemical Society

Funder

The authors acknowledge the supports from Hong Kong Research Grants Council (HKBU 22304115), Hong Kong Baptist University (FRG2/16-17/024, FRG1/15-16/052, SDF/ 03-17-096) and the Areas of Excellence Scheme, University Grants Committee, Hong Kong SAR ([AoE/P-03/08]), the Swedish Research Council, the Swedish Energy Agency and the Knut & Alice Wallenberg Foundation, and the Natural Science Foundation of China (21120102036 and 91233201).

DOI

10.1021/acsami.7b01904

Link to Publisher's Edition

http://dx.doi.org/10.1021/acsami.7b01904

ISSN (print)

19448244

ISSN (electronic)

19448252

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