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The role of surface recombination on the performance of perovskite solar cells: Effect of morphology and crystalline phase of TiO2 contact

The role of surface recombination on the performance of perovskite solar cells: Effect of morphology and crystalline phase of TiO2 contact
The role of surface recombination on the performance of perovskite solar cells: Effect of morphology and crystalline phase of TiO2 contact

Herein, the preparation of 1D TiO2 nanocolumnar films grown by plasma-enhanced chemical vapor deposition is reported as the electron selective layer (ESL) for perovskite solar devices. The impact of the ESL architecture (1D and 3D morphologies) and the nanocrystalline phase (anatase and amorphous) is analyzed. For anatase structures, similar power conversion efficiencies are achieved using an ESL either the 1D nanocolumns or the classical 3D nanoparticle film. However, lower power conversion efficiencies and different optoelectronic properties are found for perovskite devices based on amorphous 1D films. The use of amorphous TiO2 as electron selective contact produces a bump in the reverse scan of the current–voltage curve as well as an additional electronic signal, detected by impedance spectroscopy measurements. The dependence of this additional signal on the optical excitation wavelength used in the IS experiments suggests that it stems from an interfacial process. Calculations using a drift-diffusion model which explicitly considers the selective contacts reproduces qualitatively the main features observed experimentally. These results demonstrate that for a solar cell in which the contact is working properly the open-circuit photovoltage is mainly determined by bulk recombination, whereas the introduction of a “bad contact” shifts the balance to surface recombination.

drift-diffusion modeling, hysteresis, perovskite, recombination, TiO contact
Idígoras, Jesús
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Contreras-Bernal, Lidia
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Cave, James M.
a1036cfa-7f83-45e9-9543-58111dea690d
Courtier, Nicola E.
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Barranco, Ángel
9507dd63-def2-4f04-af8e-2ed9c300d8e8
Borras, Ana
f594d258-12ff-4a2d-9dc8-900d8dcec573
Sánchez-Valencia, Juan R.
f1a26a34-0853-4316-9903-6e4112417ec9
Anta, Juan A.
7763342f-1e1a-412f-8798-59cb90f09022
Walker, Alison B.
c3875e6c-168f-43da-b938-04164dd9e2e4
Idígoras, Jesús
0f798c35-4fa3-4de7-972e-d4c9f1f1279e
Contreras-Bernal, Lidia
6e2f277f-189b-4128-96c3-f03ef62a6a6a
Cave, James M.
a1036cfa-7f83-45e9-9543-58111dea690d
Courtier, Nicola E.
9c4e0fa1-e239-4a4b-aa70-af65f8b0a524
Barranco, Ángel
9507dd63-def2-4f04-af8e-2ed9c300d8e8
Borras, Ana
f594d258-12ff-4a2d-9dc8-900d8dcec573
Sánchez-Valencia, Juan R.
f1a26a34-0853-4316-9903-6e4112417ec9
Anta, Juan A.
7763342f-1e1a-412f-8798-59cb90f09022
Walker, Alison B.
c3875e6c-168f-43da-b938-04164dd9e2e4

Idígoras, Jesús, Contreras-Bernal, Lidia, Cave, James M., Courtier, Nicola E., Barranco, Ángel, Borras, Ana, Sánchez-Valencia, Juan R., Anta, Juan A. and Walker, Alison B. (2018) The role of surface recombination on the performance of perovskite solar cells: Effect of morphology and crystalline phase of TiO2 contact. Advanced Materials Interfaces, 5 (21). (doi:10.1002/admi.201801076).

Record type: Article

Abstract

Herein, the preparation of 1D TiO2 nanocolumnar films grown by plasma-enhanced chemical vapor deposition is reported as the electron selective layer (ESL) for perovskite solar devices. The impact of the ESL architecture (1D and 3D morphologies) and the nanocrystalline phase (anatase and amorphous) is analyzed. For anatase structures, similar power conversion efficiencies are achieved using an ESL either the 1D nanocolumns or the classical 3D nanoparticle film. However, lower power conversion efficiencies and different optoelectronic properties are found for perovskite devices based on amorphous 1D films. The use of amorphous TiO2 as electron selective contact produces a bump in the reverse scan of the current–voltage curve as well as an additional electronic signal, detected by impedance spectroscopy measurements. The dependence of this additional signal on the optical excitation wavelength used in the IS experiments suggests that it stems from an interfacial process. Calculations using a drift-diffusion model which explicitly considers the selective contacts reproduces qualitatively the main features observed experimentally. These results demonstrate that for a solar cell in which the contact is working properly the open-circuit photovoltage is mainly determined by bulk recombination, whereas the introduction of a “bad contact” shifts the balance to surface recombination.

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More information

e-pub ahead of print date: 8 October 2018
Published date: 9 November 2018
Keywords: drift-diffusion modeling, hysteresis, perovskite, recombination, TiO contact

Identifiers

Local EPrints ID: 427376
URI: https://eprints.soton.ac.uk/id/eprint/427376
PURE UUID: 194d4c4f-448a-431a-ae68-f32c9bc1a4c9

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Date deposited: 14 Jan 2019 17:30
Last modified: 14 Jan 2019 17:30

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Contributors

Author: Jesús Idígoras
Author: Lidia Contreras-Bernal
Author: James M. Cave
Author: Ángel Barranco
Author: Ana Borras
Author: Juan R. Sánchez-Valencia
Author: Juan A. Anta
Author: Alison B. Walker

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