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Origin of open-circuit voltage enhancements in planar Perovskite solar cells induced by addition of bulky organic cations
File | Description | Size | Format | |
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Lin Voc bulky cation additives AFM1028 R1.docx | Accepted version | 1.83 MB | Microsoft Word | View/Open |
Title: | Origin of open-circuit voltage enhancements in planar Perovskite solar cells induced by addition of bulky organic cations |
Authors: | Lin, C-T Lee, J Kim, J Macdonald, TJ Ngiam, J Xu, B Daboczi, M Xu, W Pont, S Park, B Kang, H Kim, J-S Payne, DJ Lee, K Durrant, JR McLachlan, MA |
Item Type: | Journal Article |
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 1.06 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. |
Issue Date: | 12-Feb-2020 |
Date of Acceptance: | 12-Dec-2019 |
URI: | http://hdl.handle.net/10044/1/77991 |
DOI: | 10.1002/adfm.201906763 |
ISSN: | 1616-301X |
Publisher: | Wiley |
Journal / Book Title: | Advanced Functional Materials |
Volume: | 30 |
Issue: | 7 |
Copyright Statement: | © 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article, which has been published in final form at https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201906763. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. |
Sponsor/Funder: | Engineering and Physical Sciences Research Council National Research Foundation of Korea (NRF) |
Funder's Grant Number: | EP/L016702/1 NRF-2017K1A1A2013153 |
Keywords: | Science & Technology Physical Sciences Technology Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics bulky cation additive crystal growth grain structure perovskite solar cells surface analysis ENERGY-LEVEL ALIGNMENT HALIDE PEROVSKITE GRAIN-BOUNDARIES EFFICIENT INTERFACE TRIHALIDE RECOMBINATION PASSIVATION STABILITY Science & Technology Physical Sciences Technology Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics bulky cation additive crystal growth grain structure perovskite solar cells surface analysis ENERGY-LEVEL ALIGNMENT HALIDE PEROVSKITE GRAIN-BOUNDARIES EFFICIENT INTERFACE TRIHALIDE RECOMBINATION PASSIVATION STABILITY 02 Physical Sciences 03 Chemical Sciences 09 Engineering Materials |
Publication Status: | Published |
Article Number: | ARTN 1906763 |
Online Publication Date: | 2019-12-12 |
Appears in Collections: | Materials Physics Chemistry Experimental Solid State Faculty of Natural Sciences |