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Origin of Open‐Circuit Voltage Enhancements in Planar Perovskite Solar Cells Induced by Addition of Bulky Organic Cations

Chieh‐Ting Lin, Jinho Lee, Jinhyun Kim, Thomas J. Macdonald, Jonathan Ngiam, Bob Xu, Matyas Daboczi, Weidong Xu, Sebastian Pont, Byoungwook Park, Hongkyu Kang, Ji‐Seon Kim, David J. Payne, Kwanghee Lee, James Durrant Orcid Logo, Martyn A. McLachlan

Advanced Functional Materials, Volume: 30, Issue: 7, Start page: 1906763

Swansea University Author: James Durrant Orcid Logo

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DOI (Published version): 10.1002/adfm.201906763

Abstract

The origin of performance enhancements in p‐i‐n perovskite solar cells (PSCs) when incorporating low concentrations of the bulky cation 1‐naphthylmethylamine (NMA) are discussed. A 0.25 vol % addition of NMA increases the open circuit voltage (Voc) of methylammonium lead iodide (MAPbI3) PSCs from 1....

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Published in: Advanced Functional Materials
ISSN: 1616-301X 1616-3028
Published: Wiley 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa53130
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spelling 2020-07-01T16:41:11.3299351 v2 53130 2020-01-07 Origin of Open‐Circuit Voltage Enhancements in Planar Perovskite Solar Cells Induced by Addition of Bulky Organic Cations f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2020-01-07 MTLS The origin of performance enhancements in p‐i‐n perovskite solar cells (PSCs) when incorporating low concentrations of the bulky cation 1‐naphthylmethylamine (NMA) are discussed. A 0.25 vol % addition of NMA increases the open circuit voltage (Voc) of methylammonium lead iodide (MAPbI3) PSCs from 1.06 to 1.16 V and their power conversion efficiency (PCE) from 18.7% to 20.1%. X‐ray photoelectron spectroscopy and low energy ion scattering data show NMA is located at grain surfaces, not the bulk. Scanning electron microscopy shows combining NMA addition with solvent assisted annealing creates large grains that span the active layer. Steady state and transient photoluminescence data show NMA suppresses non‐radiative recombination resulting from charge trapping, consistent with passivation of grain surfaces. Increasing the NMA concentration reduces device short‐circuit current density and PCE, also suppressing photoluminescence quenching at charge transport layers. Both Voc and PCE enhancements are observed when bulky cations (phenyl(ethyl/methyl)ammonium) are incorporated, but not smaller cations (Cs/MA)—indicating size is a key parameter. Finally, it demonstrates that NMA also enhances mixed iodide/bromide wide bandgap PSCs (Voc of 1.22 V with a 1.68 eV bandgap). The results demonstrate a facile approach to maximizing Voc and provide insights into morphological control and charge carrier dynamics induced by bulky cations in PSCs. Journal Article Advanced Functional Materials 30 7 1906763 Wiley 1616-301X 1616-3028 12 2 2020 2020-02-12 10.1002/adfm.201906763 https://spiral.imperial.ac.uk/handle/10044/1/77991 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2020-07-01T16:41:11.3299351 2020-01-07T10:50:47.6863091 Chieh‐Ting Lin 1 Jinho Lee 2 Jinhyun Kim 3 Thomas J. Macdonald 4 Jonathan Ngiam 5 Bob Xu 6 Matyas Daboczi 7 Weidong Xu 8 Sebastian Pont 9 Byoungwook Park 10 Hongkyu Kang 11 Ji‐Seon Kim 12 David J. Payne 13 Kwanghee Lee 14 James Durrant 0000-0001-8353-7345 15 Martyn A. McLachlan 16
title Origin of Open‐Circuit Voltage Enhancements in Planar Perovskite Solar Cells Induced by Addition of Bulky Organic Cations
spellingShingle Origin of Open‐Circuit Voltage Enhancements in Planar Perovskite Solar Cells Induced by Addition of Bulky Organic Cations
James Durrant
title_short Origin of Open‐Circuit Voltage Enhancements in Planar Perovskite Solar Cells Induced by Addition of Bulky Organic Cations
title_full Origin of Open‐Circuit Voltage Enhancements in Planar Perovskite Solar Cells Induced by Addition of Bulky Organic Cations
title_fullStr Origin of Open‐Circuit Voltage Enhancements in Planar Perovskite Solar Cells Induced by Addition of Bulky Organic Cations
title_full_unstemmed Origin of Open‐Circuit Voltage Enhancements in Planar Perovskite Solar Cells Induced by Addition of Bulky Organic Cations
title_sort Origin of Open‐Circuit Voltage Enhancements in Planar Perovskite Solar Cells Induced by Addition of Bulky Organic Cations
author_id_str_mv f3dd64bc260e5c07adfa916c27dbd58a
author_id_fullname_str_mv f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant
author James Durrant
author2 Chieh‐Ting Lin
Jinho Lee
Jinhyun Kim
Thomas J. Macdonald
Jonathan Ngiam
Bob Xu
Matyas Daboczi
Weidong Xu
Sebastian Pont
Byoungwook Park
Hongkyu Kang
Ji‐Seon Kim
David J. Payne
Kwanghee Lee
James Durrant
Martyn A. McLachlan
format Journal article
container_title Advanced Functional Materials
container_volume 30
container_issue 7
container_start_page 1906763
publishDate 2020
institution Swansea University
issn 1616-301X
1616-3028
doi_str_mv 10.1002/adfm.201906763
publisher Wiley
url https://spiral.imperial.ac.uk/handle/10044/1/77991
document_store_str 0
active_str 0
description The origin of performance enhancements in p‐i‐n perovskite solar cells (PSCs) when incorporating low concentrations of the bulky cation 1‐naphthylmethylamine (NMA) are discussed. A 0.25 vol % addition of NMA increases the open circuit voltage (Voc) of methylammonium lead iodide (MAPbI3) PSCs from 1.06 to 1.16 V and their power conversion efficiency (PCE) from 18.7% to 20.1%. X‐ray photoelectron spectroscopy and low energy ion scattering data show NMA is located at grain surfaces, not the bulk. Scanning electron microscopy shows combining NMA addition with solvent assisted annealing creates large grains that span the active layer. Steady state and transient photoluminescence data show NMA suppresses non‐radiative recombination resulting from charge trapping, consistent with passivation of grain surfaces. Increasing the NMA concentration reduces device short‐circuit current density and PCE, also suppressing photoluminescence quenching at charge transport layers. Both Voc and PCE enhancements are observed when bulky cations (phenyl(ethyl/methyl)ammonium) are incorporated, but not smaller cations (Cs/MA)—indicating size is a key parameter. Finally, it demonstrates that NMA also enhances mixed iodide/bromide wide bandgap PSCs (Voc of 1.22 V with a 1.68 eV bandgap). The results demonstrate a facile approach to maximizing Voc and provide insights into morphological control and charge carrier dynamics induced by bulky cations in PSCs.
published_date 2020-02-12T04:05:57Z
_version_ 1763753441872576512
score 11.013731

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