Related Experiment Video
Updated: Jan 12, 2026
09:15
Light Enhanced Hydrofluoric Acid Passivation: A Sensitive Technique for Detecting Bulk Silicon Defects
Published on: January 4, 2016
9.6K
Surface Passivation for Halide Optoelectronics: Comparing Optimization and Reactivity of Amino-Silanes with
Zixu Huang1, Farhad Akrami1, Junxiang Zhang2
1Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.
Journal of the American Chemical Society
|November 7, 2025
Summary
Amino-silanes enhance halide perovskite optoelectronics, but deposition time is critical. AEAPTMS offers better performance and a wider processing window than APTMS, with reactivity impacting results.
Area of Science:
- Materials Science
- Chemical Engineering
- Optoelectronics
Background:
- Amino-silane surface passivation is crucial for halide perovskite optoelectronics.
- Optimizing passivation strategies is key to improving device efficiency and stability.
Purpose of the Study:
- Compare the effectiveness of (3-aminopropyl)trimethoxysilane (APTMS) and [3-(2-aminoethylamino)propyl]trimethoxysilane (AEAPTMS) for perovskite passivation.
- Investigate the impact of deposition time on passivation quality and device performance.
- Elucidate the chemical interactions between amino-silanes and halide perovskites.
Main Methods:
- Room-temperature vacuum deposition of APTMS and AEAPTMS on FA0.78Cs0.22Pb(I0.85Br0.15)3 perovskite films.
- Photoluminescence spectroscopy to assess film quality.
- Fabrication and characterization of photovoltaic devices.
- Nuclear Magnetic Resonance (NMR) and Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) for chemical analysis.
Main Results:
- Both APTMS and AEAPTMS improve photoluminescence and device performance, with AEAPTMS showing superior results.
- Deposition time significantly affects passivation efficacy; overexposure, especially with APTMS, degrades performance.
- NMR and ToF-SIMS confirm reactions between amino-silanes and formamidinium cations in perovskites.
Conclusions:
- AEAPTMS provides a more robust processing window and higher performance in perovskite optoelectronics compared to APTMS.
- Careful optimization of deposition time is essential to balance effective passivation with potential performance degradation.
- Amino-silane passivation involves direct chemical reactions with perovskite components, influencing device outcomes.
More Related Videos
08:48Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment
Published on: November 9, 2015
8.6K
08:12Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
10.0K
Related Concept Videos
01:07Acid Halides to Amides: Aminolysis
4.1K
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
4.1K
02:26Preparation and Reactions of Sulfides
5.7K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
5.7K
02:45Alkyl Halides
19.5K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
19.5K
01:25Basicity of Heterocyclic Aromatic Amines
6.9K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
6.9K
01:19Amines to Amides: Acylation of Amines
3.4K
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
3.4K
01:22Preparation of 1° Amines: Azide Synthesis
4.5K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
4.5K