High-efficiency fullerene solar cells enabled by a spontaneously formed mesostructured CuSCN-nanowire heterointerface

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Title: High-efficiency fullerene solar cells enabled by a spontaneously formed mesostructured CuSCN-nanowire heterointerface
Authors: Sit, WY
Eisner, FD
Lin, YH
Firdaus, Y
Seitkhan, A
Balawi, AH
Laquai, F
Burgess, CH
Mclachlan, MA
Volonakis, G
Giustino, F
Anthopoulos, TD
Item Type: Journal Article
Abstract: Fullerenes and their derivatives are widely used as electron acceptors in bulk-heterojunction organic solar cells as they combine high electron mobility with good solubility and miscibility with relevant semiconducting polymers. However, studies on the use of fullerenes as the sole photogeneration and charge-carrier material are scarce. Here, a new type of solution-processed small-molecule solar cell based on the two most commonly used methanofullerenes, namely [6,6]-phenyl-C61-butyric acid methyl ester (PC 60 BM) and [6,6]-phenyl-C71-butyric acid methyl ester (PC 70 BM), as the light absorbing materials, is reported. First, it is shown that both fullerene derivatives exhibit excellent ambipolar charge transport with balanced hole and electron mobilities. When the two derivatives are spin-coated over the wide bandgap p-type semiconductor copper (I) thiocyanate (CuSCN), cells with power conversion efficiency (PCE) of ≈1%, are obtained. Blending the CuSCN with PC 70 BM is shown to increase the performance further yielding cells with an open-circuit voltage of ≈0.93 V and a PCE of 5.4%. Microstructural analysis reveals that the key to this success is the spontaneous formation of a unique mesostructured p-n-like heterointerface between CuSCN and PC 70 BM. The findings pave the way to an exciting new class of single photoactive material based solar cells.
Issue Date: 1-Apr-2018
Date of Acceptance: 11-Jan-2018
URI: http://hdl.handle.net/10044/1/57176
DOI: https://dx.doi.org/10.1002/advs.201700980
ISSN: 2198-3844
Publisher: Wiley
Journal / Book Title: Advanced Science
Volume: 5
Issue: 4
Copyright Statement: © 2018 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited (https://creativecommons.org/licenses/by/4.0/).
Sponsor/Funder: Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/J001473/1
EP/K503381/1
N/A
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Chemistry
Science & Technology - Other Topics
Materials Science
copper (I) thiocyanate
fullerenes
mesostructured heterointerfaces
PCBM
solar cells
OPEN-CIRCUIT-VOLTAGE
ORGANIC PHOTOVOLTAIC CELLS
13-PERCENT EFFICIENCY
CHARGE SEPARATION
POLYMER
METHANOFULLERENE
TRANSISTORS
GENERATION
TRANSPORT
ACCEPTOR
PCBM
copper (I) thiocyanate
fullerenes
mesostructured heterointerfaces
solar cells
Publication Status: Published
Article Number: 1700980
Online Publication Date: 2018-02-02
Appears in Collections:Faculty of Engineering
Materials
Physics
Experimental Solid State
Faculty of Natural Sciences



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