Scientists in Japan have fabricated an inverted pervoskite cell with a model new bond/cost-regulated defect passivation methodology consisting of introducing bifunctional molecules onto the perovskite absorber. The system exhibited a low open circuit voltage deficit and memorable stability.
Researchers at Japan’s Nationwide Institute for Provides Science (NIMS) have fabricated a photograph voltaic cell with a “n-i-p” construction and perovskite supplies that don’t embody methylammonium (MA) molecules. These molecules have intrinsic thermal instability and contribute to elevating the usual thermal instability of perovskite PV devices.
Within the n-i-p or “inverted” construction, the picture voltaic cell is illuminated utilizing the electron-transport layer (ETL) side; inside the p-i-n development, it is illuminated utilizing the outlet‐transport layer (HTL) ground.
The scientists said they constructed the cell with a model new bond/cost-regulated defect passivation methodology consisting of introducing bifunctional molecules onto the perovskite absorber. “We present that the totally different molecular properties end in distinct variations inside the film growth, supplies distribution, and system traits,” they outlined. “The bifunctional molecular passivation significantly impacts the film morphology and ground chemistries by their basicity and adsorption vitality.”
They used, particularly, molecules with an alkyl core usually known as piperazine dihydride (PZDI), which they said mitigates ground and bulk defects, whereas modifying ground chemistry or interfacial vitality band.
The group designed the cell with an indium tin oxide (ITO) substrate, a niche transport layer (HTL) fabricated from nickel(II) oxide (NiOx), a dimethoxy carbazole (MeO-2PACz) layer, the perovskite absorber, an interfacial passivation layer (IPL) based mostly totally on the bifunctional molecules, an electron transport layer (ETL) based mostly totally on a buckminsterfullerene (C60), a bathocuproine (BCP) buffer layer, and a silver (Ag) metal contact.
Examined under commonplace illumination conditions, a 1cm2 picture voltaic cell constructed with this configuration exhibited an affect conversion effectivity of 23.17% advert a low open circuit voltage deficit of round 0.327 V. The lecturers moreover found the system confirmed negligible J-V hysteresis and “superior” operational system stability under heat and humidity stress compared with administration devices.
They provided the model new cell design inside the analysis “Defect passivation in methylammonium/bromine free inverted perovskite solar cells using charge-modulated molecular bonding,” printed in nature communications. “These outcomes level out the ground treatment with PZDI is propitious for defect passivation ensuing from stronger localized nitrogen bonding in halide perovskite film and due to this fact leads to the prevalence of system effectivity.”
In October 2022, the NIMS unveiled a perovskite picture voltaic cell with out MA to boost the system’s thermal stability. The scientists used pentafluorophenylhydrazine (5F-PHZ) as an alternative to MA for the interfacial passivation of the perovskite layer and constructed a cell with a p-i-n system development and an area of 1 cm2.
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