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Charge Transport Limitations in Perovskite Solar Cells: The Effect of Charge Extraction Layers

Lookup NU author(s): Dr Pablo Docampo

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by American Chemical Society, 2017.

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Abstract

© 2017 American Chemical Society. Understanding the charge transport characteristics and their limiting factors in organolead halide perovskites is of great importance for the development of competitive and economically advantageous photovoltaic systems derived from these materials. In the present work, we examine the charge carrier mobilities in CH3NH3PbI3 (MAPI) thin films obtained from a one-step synthesis procedure and in planar n-i-p devices based on these films. By performing time-of-flight measurements, we find mobilities around 6 cm2/V s for electrons and holes in MAPI thin films, whereas in working solar cells, the respective effective mobility values are reduced by 3 orders of magnitude. From complementary experiments on devices with varying thicknesses of electron and hole transport layers, we identify the charge extraction layers and the associated interfaces rather than the perovskite material itself as the major limiting factors of the charge carrier transport time in working devices.

Publication metadata

Author(s): Grill I, Ayguler MF, Bein T, Docampo P, Hartmann NF, Handloser M, Hartschuh A

Publication type: Article

Publication status: Published

Journal: ACS Applied Materials and Interfaces

Year: 2017

Volume: 9

Issue: 43

Pages: 37655-37661

Print publication date: 01/11/2017

Online publication date: 11/10/2017

Acceptance date: 11/10/2017

Date deposited: 18/12/2017

ISSN (print): 1944-8244

ISSN (electronic): 1944-8252

Publisher: American Chemical Society

URL: https://doi.org/10.1021/acsami.7b09567

DOI: 10.1021/acsami.7b09567

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