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Issue 7, 2016
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Elimination of the light soaking effect and performance enhancement in perovskite solar cells using a fullerene derivative

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Abstract

In this work, we investigate how electron extraction layers (EELs) with different dielectric constants affect the device performance and the light-soaking phenomenon in hybrid perovskite solar cells (HPSCs). Fulleropyrrolidine with a triethylene glycol monoethyl ether side chain (PTEG-1) having a dielectric constant of 5.9 is employed as an EEL in HPSCs. The commonly used fullerene derivative [60]PCBM, which has identical energy levels but a lower dielectric constant of 3.9, is used as a reference. The device using PTEG-1 as the EEL shows a negligible light soaking effect, with a power conversion efficiency (PCE) of 15.2% before light soaking and a minor increase to 15.7% after light soaking. In contrast, the device using [60]PCBM as the EEL shows severe light soaking, with the PCE improving from 3.8% to 11.7%. Photoluminescence spectroscopy and impedance spectroscopy measurements indicate that trap-assisted recombination at the interface between the hybrid perovskite and the EEL is the cause of the light soaking effect in HPSCs. The trap-assisted recombination is effectively suppressed at the perovskite/PTEG-1 interface, while severe trap assisted recombination takes place at the perovskite/[60]PCBM interface. We attributed these experimental findings to the fact that the higher dielectric constant of PTEG-1 helps to screen the recombination between the traps and free electrons. In addition, the electron donating side chains of PTEG-1 may also contribute to the passivation of the electron traps. As a consequence, the devices using PTEG-1 as the EEL display a considerable increase in the efficiency and a negligible light soaking effect.

Graphical abstract: Elimination of the light soaking effect and performance enhancement in perovskite solar cells using a fullerene derivative

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Publication details

The article was received on 09 May 2016, accepted on 01 Jun 2016 and first published on 02 Jun 2016


Article type: Paper
DOI: 10.1039/C6EE01337F
Citation: Energy Environ. Sci., 2016,9, 2444-2452
  • Open access: Creative Commons BY license
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    Elimination of the light soaking effect and performance enhancement in perovskite solar cells using a fullerene derivative

    S. Shao, M. Abdu-Aguye, L. Qiu, L. Lai, J. Liu, S. Adjokatse, F. Jahani, M. E. Kamminga, G. H. ten Brink, T. T. M. Palstra, B. J. Kooi, J. C. Hummelen and M. Antonietta Loi, Energy Environ. Sci., 2016, 9, 2444
    DOI: 10.1039/C6EE01337F

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