Photovoltaic & Optoelectronic Device Group

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Evidence and implications for exciton dissociation in lead halide perovskites

EPJ Web of Conferences EDP Sciences 205 (2019) 06018

Authors:

Vandana Tiwari, Hong-Guang Duan, Ajay Jha, Pabitra K Nayak, Michael Thorwart, Henry J Snaith, RJ Dwayne Miller

Structural and Optical Properties of Cs2AgBiBr6 Double Perovskite

ACS Energy Letters American Chemical Society (ACS) (2018) 299-305

Authors:

Laura Schade, Adam D Wright, Roger D Johnson, Markus Dollmann, Bernard Wenger, Pabitra K Nayak, Dharmalingam Prabhakaran, Laura M Herz, Robin Nicholas, Henry J Snaith, Paolo G Radaelli

Solubilization of Carbon Nanotubes with Ethylene-Vinyl Acetate for Solution-Processed Conductive Films and Charge Extraction Layers in Perovskite Solar Cells.

ACS Appl Mater Interfaces (2018)

Authors:

Giulio Mazzotta, Markus Dollmann, Severin N Habisreutinger, M Greyson Christoforo, Zhiping Wang, Henry J Snaith, Moritz K Riede, Robin J Nicholas

Abstract:

Carbon nanotube (CNT) solubilization via non-covalent wrapping of conjugated semiconducting polymers is a common technique used to produce stable dispersions for depositing CNTs from solution. Here, we report the use of a non-conjugated insulating polymer, ethylene vinyl acetate (EVA), to disperse multi- and single-walled CNTs (MWCNT and SWCNT) in organic solvents. We demonstrate that despite the insulating nature of the EVA, we can produce semitransparent films with conductivities of up to 34 S/cm. We show, using photoluminescence spectroscopy, that the EVA strongly binds to individual CNTs, thus making them soluble, preventing aggregation, and facilitating the deposition of high-quality films. To prove the good electronic properties of this composite, we have fabricated perovskite solar cells using EVA/SWCNTs and EVA/MWCNTs as selective hole contact, obtaining power conversion efficiencies of up to 17.1%, demonstrating that the insulating polymer does not prevent the charge transfer from the active material to the CNTs.

Elucidating the long-range charge carrier mobility in metal halide perovskite thin films

(2018)

Authors:

Jongchul Lim, Maximilian T Hoerantner, Nobuya Sakai, James M Ball, Suhas Mahesh, Nakita K Noel, Yen-Hung Lin, Jay B Patel, David P McMeekin, Michael B Johnston, Bernard Wenger, Henry J Snaith

Elucidating the long-range charge carrier mobility in metal halide perovskite thin films

Energy & Environmental Science Royal Society of Chemistry (RSC) (2018)

Authors:

Jongchul Lim, Maximilian Hoerantner, Nobuya Sakai, James M Ball, Suhas Mahesh, Nakita K Noel, Yen-Hung Lin, Jay Patel, David McMeekin, Michael B Johnston, Bernard Wenger, Henry Snaith

Abstract:

Many optoelectronic properties have been reported for lead halide perovskite polycrystalline films. However, ambiguities in the evaluation of these properties remain, especially for long-range lateral charge transport, where ionic conduction...