journal article·2017-07Open access

Incorporation of Counter Ions in Organic Molecules: New Strategy in Developing Dopant‐Free Hole Transport Materials for Efficient Mixed‐Ion Perovskite Solar Cells

Jinbao Zhang, Bo Xu, Li Yang, Alba Mingorance, Changqing Ruan, Yong Hua, Linqin Wang, Nick Vlachopoulos, Mónica Lira‐Cantú, Gerrit Boschloo, Anders Hagfeldt, Licheng Sun, Erik M. J. Johansson

Advanced Energy Materials· Volume 7· Issue 14

Abstract

Hole transport matertial (HTM) as charge selective layer in perovskite solar cells (PSCs) plays an important role in achieving high power conversion efficiency (PCE). It is known that the dopants and additives are necessary in the HTM in order to improve the hole conductivity of the HTM as well as to obtain high efficiency in PSCs, but the additives can potentially induce device instability and poor device reproducibility. In this work a new strategy to design dopant‐free HTMs has been presented by modifying the HTM to include charged moieties which are accompanied with counter ions. The device based on this ionic HTM X44 dos not need any additional doping and the device shows an impressive PCE of 16.2%. Detailed characterization suggests that the incorporated counter ions in X44 can significantly affect the hole conductivity and the homogeneity of the formed HTM thin film. The superior photovoltaic performance for X44 is attributed to both efficient hole transport and effective interfacial hole transfer in the solar cell device. This work provides important insights as regards the future design of new and efficient dopant free HTMs for photovotaics or other optoelectronic applications.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Organic Light-Emitting Diodes Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Physical Chemistry Center of Molecular Devices Department of Chemistry–Ångström Laboratory Uppsala University SE‐75120 Uppsala Sweden

Organic Chemistry Center of Molecular Devices Department of Chemistry School of Chemical Science and Engineering KTH Royal Institute of Technology SE‐10044 Stockholm Sweden

Nanotechnology and Functional Materials Department of Engineering Science Uppsala University SE‐75120 Uppsala Sweden

Catalan Institute of Nanoscience and Nanotechnology (ICN2) CSIC and The Barcelona Institute of Science and Technology Campus UAB Bellaterra 08193 Barcelona Spain

Applied Physical Chemistry Center of Molecular Devices Department of Chemistry KTH‐Royal Institute of Technology Teknikringen 30 SE‐10044 Stockholm Sweden

Laboratory of Photomolecular Science Institute of Chemical Sciences and Engineering École Polytechnique Fédérale de Lausanne EPFL‐FSB‐ISIC‐LSPM Chemin des Alambics, Station 6 CH‐1015 Lausanne Switzerland

State Key Laboratory of Fine Chemicals DUT‐KTH Joint Education and Research Center on Molecular Devices Dalian University of Technology (DUT) 116024 Dalian China

Funding

Energimyndigheten · Vetenskapsrådet · Svenska Forskningsrådet Formas

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