Related Experiment Video
Updated: May 15, 2025
06:06
The Sleep Nullifying Apparatus: A Highly Efficient Method of Sleep Depriving Drosophila
Published on: December 14, 2020
3.3K
SnO2/Perovskite Interface Engineering with Mixed-Halide Potassium Salts: A Pathway to Efficient and Stable Perovskite
Ibrahim Muhammad Adam1, Kay Thi Soe1, Waranchit Ruengsrisang2
1Nanoscience and Nanotechnology Graduate Program, Faculty of Science, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand.
ACS Applied Materials & Interfaces
|May 14, 2025
Summary
Potassium halide salts effectively passivate tin oxide surfaces in perovskite solar cells by removing defects. This enhances device efficiency and stability, offering a promising strategy for solar technology advancement.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Tin(IV) oxide (SnO2) is a key electron transport layer in perovskite solar cells (PSCs).
- Surface defects at the SnO2/perovskite interface, like oxygen vacancies and hydroxyl groups, hinder device performance and stability.
- The atomic-level passivation mechanisms of alkali halide salts at the heterointerface are not fully understood.
Purpose of the Study:
- To investigate the passivation effects of potassium halide salts (KI, KCl, KI+KCl) on the SnO2/MAPbI3 interface.
- To elucidate the atomic-level mechanisms responsible for efficiency and stability improvements in PSCs.
- To demonstrate a strategy for enhancing perovskite solar cell performance and longevity.
Main Methods:
- Experimental characterization of SnO2/MAPbI3 interfaces treated with potassium halide salts.
- Density Functional Theory (DFT) calculations to analyze defect passivation and interfacial interactions.
- Fabrication and performance testing of perovskite solar cells with treated SnO2 layers.
Main Results:
- Potassium ions and halide ions facilitate the removal of oxygen vacancies and hydroxyl groups via KOH formation, reducing hydroxyl bond strength and improving interfacial ordering.
- Potassium halide salt treatment leads to smoother interfaces, larger perovskite grains, enhanced adhesion, and improved charge extraction.
- KI and KI+KCl treated devices achieved power conversion efficiencies (PCEs) of 19.86% and 19.15%, respectively, with the mixed salt treatment showing superior long-term stability (>96% PCE after 1000 hours).
Conclusions:
- Potassium halide salts effectively passivate SnO2/perovskite interfaces by addressing surface defects and strengthening interfacial bonds.
- The study reveals atomic-level mechanisms involving K+ and halide ions in defect removal and interface stabilization.
- Potassium halide post-treatment presents a viable strategy for significantly boosting both the efficiency and operational stability of perovskite solar cells.
Related Concept Videos
01:24Sleep-Wake Cycles
1.1K
Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
1.1K
01:21Sleep Apnea
117
Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
The condition is more prevalent among...
The condition is more prevalent among...
117
01:05Single Nucleotide Polymorphisms-SNPs
13.7K
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
13.7K
01:24Nose and Nasal Cavity
1.3K
The nose is composed of an observable exterior segment (external nose) and an internal segment within the skull known as the nasal cavity (internal nose). The external nose, visible on the face, consists of a framework of bone and hyaline cartilage enveloped in skin and muscle and lined with a mucous membrane. This structure is supported by the frontal bone, nasal bones, and maxillary bone and is supplemented by a cartilaginous framework comprising the septal nasal cartilage, lateral nasal...
1.3K
01:43Thermosensation
30.2K
Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
30.2K
01:07Narcolepsy
82
Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.
82