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Issue 33, 2019
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Simple fabrication of a highly conductive and passivated PEDOT:PSS film via cryo-controlled quasi-congealing spin-coating for flexible perovskite solar cells

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Abstract

To significantly increase the applicability of inverted-planar flexible perovskite solar cells (PSCs), the achievement of high electrical conductivity, excellent moisture resistance and reproducibility of a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole transport layer with simple fabrication (low cost and ease of mass manufacture) during spin-coating is the goal pursued by researchers. Herein, for the first time, we propose a facile strategy of cryo-controlled quasi-congealing spin-coating to improve the PEDOT:PSS quality to a new extent. The congealed surface and strengthened hydrogen-bonds between solvent and PSS chains can effectively suppress the moisture corrosion during spin-coating. In addition, the electrical conductivity of PEDOT:PSS can be further enhanced owing to the uniformity of PEDOT:PSS grains and a greater co-solvent effect facilitated by induced Young's modulus during spin-coating. A considerably smooth and uniform film with improved conductivity can be achieved even when fabricated in a high humidity environment. Furthermore, this smooth and passivated PEDOT:PSS can facilitate highly crystalline perovskite and better interfacial contact between them, which not only enhances the efficiency, but also greatly improves repeated mechanical deformation stability of PSCs. As a result, the power conversion efficiency (PCE) of rigid and flexible PSCs can be improved to 17.65% and 15.13%, respectively. Both devices show about 14% enhancement in PCE compared to the conventional one.

Graphical abstract: Simple fabrication of a highly conductive and passivated PEDOT:PSS film via cryo-controlled quasi-congealing spin-coating for flexible perovskite solar cells

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Article information


Submitted
23 May 2019
Accepted
30 Jul 2019
First published
01 Aug 2019

J. Mater. Chem. C, 2019,7, 10247-10256
Article type
Paper

Simple fabrication of a highly conductive and passivated PEDOT:PSS film via cryo-controlled quasi-congealing spin-coating for flexible perovskite solar cells

W. Chen, L. Qiu, P. Zhang, P. Jiang, P. Du, L. Song, J. Xiong and F. Ko, J. Mater. Chem. C, 2019, 7, 10247
DOI: 10.1039/C9TC02744K

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