Precise Manipulation of Multilength Scale Morphology and Its Influence on Eco‐Friendly Printed All‐Polymer Solar Cells

Ye, Long; Xiong, Yuan; Li, Sunsun; Ghasemi, Masoud; Balar, Nrup; Turner, Johnathan; Gadisa, Abay; Hou, Jianhui; O'Connor, Brendan T.; Ade, Harald

doi:10.1002/adfm.201702016

Title: Precise Manipulation of Multilength Scale Morphology and Its Influence on Eco‐Friendly Printed All‐Polymer Solar Cells

Journal Article · Mon Jul 17 00:00:00 EDT 2017 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201702016· OSTI ID:1378306

^[1]; Xiong, Yuan ^[1]; Li, Sunsun ^[2]; Ghasemi, Masoud ^[1]; Balar, Nrup ^[3]; Turner, Johnathan ^[1]; Gadisa, Abay ^[1]; Hou, Jianhui ^[2]; O'Connor, Brendan T. ^[3]; Ade, Harald ^[1]

Department of Physics, Organic and Carbon Electronics Lab (ORaCEL) North Carolina State University Raleigh NC 27695 USA
State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
Department of Mechanical and Aerospace Engineering and ORaCEL North Carolina State University Raleigh NC 27695 USA

Significant efforts have lead to demonstrations of nonfullerene solar cells (NFSCs) with record power conversion efficiency up to ≈13% for polymer:small molecule blends and ≈9% for all‐polymer blends. However, the control of morphology in NFSCs based on polymer blends is very challenging and a key obstacle to pushing this technology to eventual commercialization. The relations between phases at various length scales and photovoltaic parameters of all‐polymer bulk‐heterojunctions remain poorly understood and seldom explored. Here, precise control over a multilength scale morphology and photovoltaic performance are demonstrated by simply altering the concentration of a green solvent additive used in blade‐coated films. Resonant soft X‐ray scattering is used to elucidate the multiphasic morphology of these printed all‐polymeric films and complements with the use of grazing incidence wide‐angle X‐ray scattering and in situ spectroscopic ellipsometry characterizations to correlate the morphology parameters at different length scales to the device performance metrics. Benefiting from the highest relative volume fraction of small domains, additive‐free solar cells show the best device performance, strengthening the advantage of single benign solvent approach. This study also highlights the importance of high volume fraction of smallest domains in printed NFSCs and organic solar cells in general.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐AC02‐05CH11231

OSTI ID:: 1378306

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Vol. 27 Journal Issue: 33; ISSN 1616-301X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 93 works

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