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Thermodynamically self-organized hole transport layers for high-efficiency inverted-planar perovskite solar cells

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Abstract

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a popular and promising hole transport material for making efficient inverted-planar perovskite solar cells (IP-PSCs). However, the mismatch between the work function of conventional PEDOT:PSS and the valence band maximum of perovskite materials is still a challenge for efficient hole extraction. Here, we report systematic studies on the work-function modification and thermodynamic morphological evolution of PEDOT:PSS films by tuning the PSS/PEDOT ratio, along with its effects on the photovoltaic responses of IP-PSCs. We found that the open-circuit voltage (VOC) of an IP-PSC could be enhanced by controlling the work function of PEDOT:PSS. Furthermore, the optical transmittance of the PEDOT:PSS film could be maximized by controlling the morphological evolution, which will further increase the short-circuit current density (JSC) of the IP-PSC. The VOC and JSC of the IP-PSC with the optimized PEDOT:PSS composition increased from 0.88 to 0.93 V and from 17.11 to 20.77 mA cm−2, respectively, compared with an IP-PSC containing commercial PEDOT:PSS, which results in a power conversion energy that is greatly improved from 12.39 to 15.24%.

Graphical abstract: Thermodynamically self-organized hole transport layers for high-efficiency inverted-planar perovskite solar cells

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Publication details

The article was received on 08 May 2017, accepted on 26 Jul 2017 and first published on 27 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR03265J
Citation: Nanoscale, 2017, Advance Article
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    Thermodynamically self-organized hole transport layers for high-efficiency inverted-planar perovskite solar cells

    W. Kim, S. Kim, S. U. Chai, M. S. Jung, J. K. Nam, J. Kim and J. H. Park, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR03265J

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