Spirobisindane-based hole transporting materials for conventional and indoor halide perovskite solar cells

Abdul-Wasir Shaka; Shaoyang Wang; Nirmal Prashanth Maria Joseph Raj; Raja Sekhar Muddam; Neil B. McKeown; Dominic Taylor; Lethy Krishnan Jagadamma; Graeme Cooke

doi:10.1002/solr.202500208

Spirobisindane-based hole transporting materials for conventional and indoor halide perovskite solar cells

Abdul-Wasir Shaka, Shaoyang Wang, Nirmal Prashanth Maria Joseph Raj, Raja Sekhar Muddam, Neil B. McKeown, Dominic Taylor, Lethy Krishnan Jagadamma^*, Graeme Cooke^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

Hole transporting materials (HTMs) are a vital component for both conventional and indoor perovskite solar cells. Spiro-OMeTAD has become one of the most widely studied HTM; however, its high molecular symmetry tends to give rise to nonuniform films that are not conducive to good photovoltaic device stability and large-area processing. Moreover, other issues relating to Spiro-OMeTAD, such as high cost, have spurred investigations into the development of new HTMs. Here, we report two spirobisindane-based HTMs (AS-135 and AS-179) for conventional and indoor perovskite solar cells. The lower symmetry and ability to synthesize from cheap, readily accessible precursors provides obvious advantages over Spiro-OMeTAD. We show that spirobisindane-based HTMs are effective HTMs under both 1 Sun and indoor illumination upon doping with LiTFSi and power conversion efficiency ≈11% were demonstrated under 1 Sun and over 20% under 1000 lx indoor illuminance.

Original language	English
Article number	e202500208
Number of pages	11
Journal	Solar RRL
Volume	Early View
Early online date	15 Jul 2025
DOIs	https://doi.org/10.1002/solr.202500208
Publication status	E-pub ahead of print - 15 Jul 2025

Keywords

Indoor PV
Perovskite solar cells
Porous hole transporting materials
Shelf life
Spirobisindane-based HTM

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title = "Spirobisindane-based hole transporting materials for conventional and indoor halide perovskite solar cells",

abstract = "Hole transporting materials (HTMs) are a vital component for both conventional and indoor perovskite solar cells. Spiro-OMeTAD has become one of the most widely studied HTM; however, its high molecular symmetry tends to give rise to nonuniform films that are not conducive to good photovoltaic device stability and large-area processing. Moreover, other issues relating to Spiro-OMeTAD, such as high cost, have spurred investigations into the development of new HTMs. Here, we report two spirobisindane-based HTMs (AS-135 and AS-179) for conventional and indoor perovskite solar cells. The lower symmetry and ability to synthesize from cheap, readily accessible precursors provides obvious advantages over Spiro-OMeTAD. We show that spirobisindane-based HTMs are effective HTMs under both 1 Sun and indoor illumination upon doping with LiTFSi and power conversion efficiency ≈11\% were demonstrated under 1 Sun and over 20\% under 1000 lx indoor illuminance.",

keywords = "Indoor PV, Perovskite solar cells, Porous hole transporting materials, Shelf life, Spirobisindane-based HTM",

author = "Abdul-Wasir Shaka and Shaoyang Wang and \{Maria Joseph Raj\}, \{Nirmal Prashanth\} and Muddam, \{Raja Sekhar\} and McKeown, \{Neil B.\} and Dominic Taylor and \{Krishnan Jagadamma\}, Lethy and Graeme Cooke",

note = "Funding: A-WS thanks Tertiary Education Trust Fund (TETFund) for funding. GC thanks the Leverhulme Trust for the award of a Research Fellowship and the EPSRC for grant (EP/E036244/1). LKJ acknowledges funding from UKRI-FLF through MR/T022094/1.",

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doi = "10.1002/solr.202500208",

language = "English",

volume = "Early View",

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T1 - Spirobisindane-based hole transporting materials for conventional and indoor halide perovskite solar cells

AU - Shaka, Abdul-Wasir

AU - Wang, Shaoyang

AU - Maria Joseph Raj, Nirmal Prashanth

AU - Muddam, Raja Sekhar

AU - McKeown, Neil B.

AU - Taylor, Dominic

AU - Krishnan Jagadamma, Lethy

AU - Cooke, Graeme

N1 - Funding: A-WS thanks Tertiary Education Trust Fund (TETFund) for funding. GC thanks the Leverhulme Trust for the award of a Research Fellowship and the EPSRC for grant (EP/E036244/1). LKJ acknowledges funding from UKRI-FLF through MR/T022094/1.

PY - 2025/7/15

Y1 - 2025/7/15

N2 - Hole transporting materials (HTMs) are a vital component for both conventional and indoor perovskite solar cells. Spiro-OMeTAD has become one of the most widely studied HTM; however, its high molecular symmetry tends to give rise to nonuniform films that are not conducive to good photovoltaic device stability and large-area processing. Moreover, other issues relating to Spiro-OMeTAD, such as high cost, have spurred investigations into the development of new HTMs. Here, we report two spirobisindane-based HTMs (AS-135 and AS-179) for conventional and indoor perovskite solar cells. The lower symmetry and ability to synthesize from cheap, readily accessible precursors provides obvious advantages over Spiro-OMeTAD. We show that spirobisindane-based HTMs are effective HTMs under both 1 Sun and indoor illumination upon doping with LiTFSi and power conversion efficiency ≈11% were demonstrated under 1 Sun and over 20% under 1000 lx indoor illuminance.

AB - Hole transporting materials (HTMs) are a vital component for both conventional and indoor perovskite solar cells. Spiro-OMeTAD has become one of the most widely studied HTM; however, its high molecular symmetry tends to give rise to nonuniform films that are not conducive to good photovoltaic device stability and large-area processing. Moreover, other issues relating to Spiro-OMeTAD, such as high cost, have spurred investigations into the development of new HTMs. Here, we report two spirobisindane-based HTMs (AS-135 and AS-179) for conventional and indoor perovskite solar cells. The lower symmetry and ability to synthesize from cheap, readily accessible precursors provides obvious advantages over Spiro-OMeTAD. We show that spirobisindane-based HTMs are effective HTMs under both 1 Sun and indoor illumination upon doping with LiTFSi and power conversion efficiency ≈11% were demonstrated under 1 Sun and over 20% under 1000 lx indoor illuminance.

KW - Indoor PV

KW - Perovskite solar cells

KW - Porous hole transporting materials

KW - Shelf life

KW - Spirobisindane-based HTM

UR - https://www.scopus.com/pages/publications/105010454233

U2 - 10.1002/solr.202500208

DO - 10.1002/solr.202500208

M3 - Article

SN - 2367-198X

VL - Early View

JO - Solar RRL

JF - Solar RRL

M1 - e202500208

ER -

Spirobisindane-based hole transporting materials for conventional and indoor halide perovskite solar cells

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