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Charge extraction via graded doping of hole transport layers gives highly luminescent and stable metal halide perovskite devices

Abdi-Jalebi, M; Dar, MI; Senanayak, SP; Sadhanala, A; Andaji-Garmaroudi, Z; Pazos-Outon, LM; Richter, JM; ... Friend, RH; + view all (2019) Charge extraction via graded doping of hole transport layers gives highly luminescent and stable metal halide perovskite devices. Science Advances , 5 (2) , Article eaav2012. 10.1126/sciadv.aav2012. Green open access

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Abstract

One source of instability in perovskite solar cells (PSCs) is interfacial defects, particularly those that exist between the perovskite and the hole transport layer (HTL). We demonstrate that thermally evaporated dopant-free tetracene (120 nm) on top of the perovskite layer, capped with a lithium-doped Spiro-OMeTAD layer (200 nm) and top gold electrode, offers an excellent hole-extracting stack with minimal interfacial defect levels. For a perovskite layer interfaced between these graded HTLs and a mesoporous TiO2 electron-extracting layer, its photoluminescence yield reaches 15% compared to 5% for the perovskite layer interfaced between TiO2 and Spiro-OMeTAD alone. For PSCs with graded HTL structure, we demonstrate efficiency of up to 21.6% and an extended power output of over 550 hours of continuous illumination at AM1.5G, retaining more than 90% of the initial performance and thus validating our approach. Our findings represent a breakthrough in the construction of stable PSCs with minimized nonradiative losses.

Type: Article
Title: Charge extraction via graded doping of hole transport layers gives highly luminescent and stable metal halide perovskite devices
Open access status: An open access version is available from UCL Discovery
DOI: 10.1126/sciadv.aav2012
Publisher version: http://dx.doi.org/10.1126/sciadv.aav2012
Language: English
Additional information: Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). This is an open-access article distributed under the terms of the Creative Commons Attribution license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: FIELD-EFFECT TRANSISTORS, SOLAR-CELLS, TRIPLET EXCITONS, INTERFACE, STABILITY, TETRACENE, EFFICIENT, PERFORMANCE, DEGRADATION, PENTACENE
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery
URI: https://discovery.ucl.ac.uk/id/eprint/10092552
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