TY - JOUR
T1 - Modification of NiOx hole transport layers with 4-bromobenzylphosphonic acid and its influence on the performance of lead halide perovskite solar cells
AU - Mangalam, Jimmy
AU - Rath, Thomas
AU - Weber, Stefan
AU - Kunert, Birgit
AU - Dimoploulos, Theodorous
AU - Fian, Alexander
AU - Trimmel, Gregor
PY - 2019
Y1 - 2019
N2 - Lead halide perovskites have proved to be exceptionally efficient absorber materials for photovoltaics. Besides improving the properties of the perovskite absorbers, device engineering and the optimization of interfaces will be equally important to further the advancement of this emerging solar cell technology. Herein, we report a successful modification of the interface between the NiOx hole transport layer and the perovskite absorber layer using 4-bromobenzylphosphonic acid based self-assembled monolayers leading to an improved photovoltaic performance. The modification of the NiOx layer is carried out by dip coating which allows sufficient time for the self-assembly. The change in the surface free energy and the non-polar nature of the resulting surface is corroborated by contact angle measurements. X-ray photoelectron spectroscopy confirms the presence of phosphor and bromine on the NiOx surface. Furthermore, the resultant solar cells reveal increased photovoltage. For typical devices without and with modification, the photovoltage improves from 0.978 V to 1.029 V. The champion VOC observed was 1.099 V. The increment in photovoltage leads to improved power conversion efficiencies for the modified cells. The maximum power point tracking measurements of the devices show stable power output of the solar cells.
AB - Lead halide perovskites have proved to be exceptionally efficient absorber materials for photovoltaics. Besides improving the properties of the perovskite absorbers, device engineering and the optimization of interfaces will be equally important to further the advancement of this emerging solar cell technology. Herein, we report a successful modification of the interface between the NiOx hole transport layer and the perovskite absorber layer using 4-bromobenzylphosphonic acid based self-assembled monolayers leading to an improved photovoltaic performance. The modification of the NiOx layer is carried out by dip coating which allows sufficient time for the self-assembly. The change in the surface free energy and the non-polar nature of the resulting surface is corroborated by contact angle measurements. X-ray photoelectron spectroscopy confirms the presence of phosphor and bromine on the NiOx surface. Furthermore, the resultant solar cells reveal increased photovoltage. For typical devices without and with modification, the photovoltage improves from 0.978 V to 1.029 V. The champion VOC observed was 1.099 V. The increment in photovoltage leads to improved power conversion efficiencies for the modified cells. The maximum power point tracking measurements of the devices show stable power output of the solar cells.
KW - Solar cells
KW - perovskite
KW - self assembled monolayers
KW - phosphonic acid
KW - nickel oxide
KW - Interface
UR - http://www.scopus.com/inward/record.url?scp=85064593624&partnerID=8YFLogxK
UR - https://graz.pure.elsevier.com/en/publications/modification-of-niox-hole-transport-layers-with-4bromobenzylphosphonic-acid-and-its-influence-on-the-performance-of-lead-halide-perovskite-solar-cells(decae5eb-d03a-47d6-90eb-658de2aa5a3b).html
U2 - 10.1007/s10854-019-01294-0
DO - 10.1007/s10854-019-01294-0
M3 - Article
SN - 0957-4522
VL - 30
SP - 9602
EP - 9611
JO - Journal of Materials Science: Materials in Electronics
JF - Journal of Materials Science: Materials in Electronics
IS - 10
ER -