Enhanced electronic properties in mesoporous TiO2 via lithium doping for high-efficiency perovskite solar cells

Fabrizio Giordano; Antonio Abate; Juan Pablo Correa Baena; Michael Saliba; Taisuke Matsui; Sang Hyuk Im; Shaik M. Zakeeruddin; Mohammad Khaja Nazeeruddin; Anders Hagfeldt; Michael Graetzel

doi:10.1038/ncomms10379

Enhanced electronic properties in mesoporous TiO₂ via lithium doping for high-efficiency perovskite solar cells

Fabrizio Giordano, Antonio Abate, Juan Pablo Correa Baena, Michael Saliba, Taisuke Matsui, Sang Hyuk Im, Shaik M. Zakeeruddin, Mohammad Khaja Nazeeruddin, Anders Hagfeldt, Michael Graetzel

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

647 Citations (Scopus)

Abstract

Perovskite solar cells are one of the most promising photovoltaic technologies with their extraordinary progress in efficiency and the simple processes required to produce them. However, the frequent presence of a pronounced hysteresis in the current voltage characteristic of these devices arises concerns on the intrinsic stability of organo-metal halides, challenging the reliability of technology itself. Here, we show that n-doping of mesoporous TiO₂ is accomplished by facile post treatment of the films with lithium salts. We demonstrate that the Li-doped TiO₂ electrodes exhibit superior electronic properties, by reducing electronic trap states enabling faster electron transport. Perovskite solar cells prepared using the Li-doped films as scaffold to host the CH₃ NH₃ PbI₃ light harvester produce substantially higher performances compared with undoped electrodes, improving the power conversion efficiency from 17 to over 19% with negligible hysteretic behaviour (lower than 0.3%).

Original language	English
Article number	10379
Journal	Nature communications
Volume	7
DOIs	https://doi.org/10.1038/ncomms10379
Publication status	Published - 2016 Jan 13
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
Physics and Astronomy(all)

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1038/ncomms10379

Cite this

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title = "Enhanced electronic properties in mesoporous TiO2 via lithium doping for high-efficiency perovskite solar cells",

abstract = "Perovskite solar cells are one of the most promising photovoltaic technologies with their extraordinary progress in efficiency and the simple processes required to produce them. However, the frequent presence of a pronounced hysteresis in the current voltage characteristic of these devices arises concerns on the intrinsic stability of organo-metal halides, challenging the reliability of technology itself. Here, we show that n-doping of mesoporous TiO2 is accomplished by facile post treatment of the films with lithium salts. We demonstrate that the Li-doped TiO2 electrodes exhibit superior electronic properties, by reducing electronic trap states enabling faster electron transport. Perovskite solar cells prepared using the Li-doped films as scaffold to host the CH3 NH3 PbI3 light harvester produce substantially higher performances compared with undoped electrodes, improving the power conversion efficiency from 17 to over 19% with negligible hysteretic behaviour (lower than 0.3%).",

author = "Fabrizio Giordano and Antonio Abate and {Correa Baena}, {Juan Pablo} and Michael Saliba and Taisuke Matsui and Im, {Sang Hyuk} and Zakeeruddin, {Shaik M.} and Nazeeruddin, {Mohammad Khaja} and Anders Hagfeldt and Michael Graetzel",

note = "Funding Information: M.G. thanks the financial support from SNSF-NanoTera (SYNERGY), Swiss Federal Office of Energy (SYNERGY), CCEM-CH in the 9th call proposal 906: CONNECT PV and the SNSF NRP70 {\textquoteleft}Energy Turnaround{\textquoteright} and GRAPHENE project supported by the European Commission Seventh Framework Programme under contract 604391 is gratefully acknowledged. A.A. has received funding from the European Union{\textquoteright}s Seventh Framework Programme for research, technological development and demonstration under grant agreement no 291771. We thank Aisin Cosmos R&D Co., Ltd, Japan for financial support.",

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AU - Giordano, Fabrizio

AU - Abate, Antonio

AU - Correa Baena, Juan Pablo

AU - Saliba, Michael

AU - Matsui, Taisuke

AU - Im, Sang Hyuk

AU - Zakeeruddin, Shaik M.

AU - Nazeeruddin, Mohammad Khaja

AU - Hagfeldt, Anders

AU - Graetzel, Michael

N1 - Funding Information: M.G. thanks the financial support from SNSF-NanoTera (SYNERGY), Swiss Federal Office of Energy (SYNERGY), CCEM-CH in the 9th call proposal 906: CONNECT PV and the SNSF NRP70 ‘Energy Turnaround’ and GRAPHENE project supported by the European Commission Seventh Framework Programme under contract 604391 is gratefully acknowledged. A.A. has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement no 291771. We thank Aisin Cosmos R&D Co., Ltd, Japan for financial support.

PY - 2016/1/13

Y1 - 2016/1/13

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