BibTex format

author = {Lin, C-T and Lee, J and Kim, J and Macdonald, TJ and Ngiam, J and Xu, B and Daboczi, M and Xu, W and Pont, S and Park, B and Kang, H and Kim, J-S and Payne, DJ and Lee, K and Durrant, JR and McLachlan, MA},
doi = {10.1002/adfm.201906763},
journal = {Advanced Functional Materials},
title = {Origin of open-circuit voltage enhancements in planar Perovskite solar cells induced by addition of bulky organic cations},
url = {},
volume = {30},
year = {2020}

RIS format (EndNote, RefMan)

AB - The origin of performance enhancements in pin perovskite solar cells (PSCs) when incorporating low concentrations of the bulky cation 1naphthylmethylamine (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%. Xray 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 nonradiative recombination resulting from charge trapping, consistent with passivation of grain surfaces. Increasing the NMA concentration reduces device shortcircuit 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.
AU - Lin,C-T
AU - Lee,J
AU - Kim,J
AU - Macdonald,TJ
AU - Ngiam,J
AU - Xu,B
AU - Daboczi,M
AU - Xu,W
AU - Pont,S
AU - Park,B
AU - Kang,H
AU - Kim,J-S
AU - Payne,DJ
AU - Lee,K
AU - Durrant,JR
AU - McLachlan,MA
DO - 10.1002/adfm.201906763
PY - 2020///
SN - 1616-301X
TI - Origin of open-circuit voltage enhancements in planar Perovskite solar cells induced by addition of bulky organic cations
T2 - Advanced Functional Materials
UR -
UR -
UR -
VL - 30
ER -