The stunning rise of methylammonium lead iodide perovskite material as a light harvesting material in recent years has drawn much attention in the photovoltaic community. Here, we investigated in detail the uniform and void-free perovskite capping layer in the mesoscopic perovskite devices and found it to play a critical role in determining device performance and charge recombination process. Compared to the rough surface with voids of the perovskite layer, surface of the perovskite capping layer obtained from sequential deposition process is much more uniform with less void formation and distribution within the TiO2 mesoscopic scaffold is more homogeneous, leading to much improved photovoltaic parameters of the devices. The impact of void free perovskite capping layer surface on the charge recombination processes within the mesoscopic perovskite solar cells is further scrutinized via charge extraction measurement. Modulation of precursor solution concentrations in order to further improve the perovskite layer surface morphology leads to higher efficiency and lower charge recombination rates. Inhibited charge recombination in these solar cells also matches with the higher charge density and slower photovoltage decay profiles measured.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/c5nr06362k | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Mapping the Energy Carrier Diffusion Tensor in Perovskite Semiconductors.
ACS Nano
January 2025
Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
Understanding energy transport in semiconductors is critical for the design of electronic and optoelectronic devices. Semiconductor material properties, such as charge carrier mobility or diffusion length, are commonly measured in bulk crystals and determined using models that describe transport behavior in homogeneous media, where structural boundary effects are minimal. However, most emerging semiconductors exhibit nano- and microscale heterogeneity.
View Article and Find Full Text PDFUnveiling next-generation organic photovoltaics: Quantum mechanical insights into non-fullerene donor-acceptor compounds.
Spectrochim Acta A Mol Biomol Spectrosc
January 2025
Department of Chemistry, Government College University Faisalabad, Faisalabad 38000 Pakistan; Dry Lab (Janjua.XYZ), Physical Chemistry and Computational Modelling (PCCM), Department of Chemistry, Government College University Faisalabad, Faisalabad 38000 Pakistan. Electronic address:
Organic photovoltaics (OPVs) have improved greatly in recent years in pursuit for efficient and sustainable energy conversion methods. Specifically, utilizing quantum chemistry approaches such as density functional theory (DFT), the electronic structures, energy levels, and charge transport characteristics of donor-π-acceptor (D-π-A) systems based on non-fullerene donor and acceptor molecules have been examined and synthesized. Non-fullerene acceptors offer several advantages over traditional fullerene-based materials, such as enhanced light absorption, modifiable energy levels, and reduced recombination losses.
View Article and Find Full Text PDFEngineering Defect-Mediated S-scheme heterojunctions in MOF-Derived N-doped NiO porous microrods and ZnInS nanosheets for superior photocatalytic hydrogen evolution.
J Colloid Interface Sci
January 2025
Institute of Micro/Nano Materials and Devices, Ningbo University of Technology, Ningbo 315211 PR China. Electronic address:
The development of efficient photocatalysts inspired by natural photosynthesis has drawn considerable interest for sustainable hydrogen (H) production. Among the various strategies for enhancing H evolution, constructing step-scheme (S-scheme) heterojunctions has attracted extensive interest, thanks to their limited charge recombination and enhanced charge transport in comparison to the traditional photocatalytic systems. Herein, we report the engineering of a novel S-scheme heterojunction by integrating ultrathin ZnInS (ZIS) nanosheets with MOF-derived N-doped NiO porous microrods (ZIS/N-NiO) toward superior photocatalytic behaviors.
View Article and Find Full Text PDFEffect of growth dynamics on the structural, photophysical and pseudocapacitance properties of famatinite copper antimony sulphide colloidal nanostructures (including nanosheets).
Dalton Trans
January 2025
Department of Nanoengineering, Joint School of Nanoscience and Nanoengineering, North Carolina A&T State University, 2907 East Gate City Boulevard, Greensboro, NC 27401, USA.
Facile phase selective synthesis of copper antimony sulphide (CAS) nanostructures is important because of their tunable photoconductive and electrochemical properties. In this study, off-stoichiometric famatinite phase CAS (CAS) quasi-spherical and quasi-hexagonal colloidal nanostructures (including nanosheets) of sizes, 2.4-18.
View Article and Find Full Text PDFEnhancement of photocatalytic CO reduction in BiOBr through chirality-induced electron spin polarization regulation.
Chem Commun (Camb)
January 2025
School of Marine Science and Engineering, Hainan University, Haikou, China.
Severe photogenerated charge carrier recombination involved in photocatalytic CO reduction leads to low photocatalytic efficiency. Here we demonstrate that a chiral hierarchical structure could facilitate charge separation in BiOBr, thus suppressing charge recombination and enhancing photocatalytic performance. Chiral helical flower-like BiOBr nanospheres were prepared a D/L-sorbitol-assisted hydrothermal process, exhibiting a 1.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!