カルコゲニド半導体および光電装置のためのN,N-ダイメチルホルマミドベースの分子インクの複合化学
James A Clark1, Anna Murray1, Jung-Min Lee1
1Department of Chemical Engineering, Clean Energy Institute, Molecular Engineering & Sciences Institute , University of Washington , Seattle , Washington 98195-1750 , United States.
Journal of the American Chemical Society
|December 12, 2018
まとめ
N,N-ジメチルホルマミド (DMF) とチオウレア (TU) を用いた新しい分子インクにより,光電半導体の安定した高濃度溶液を可能にします. これは溶解性の問題を克服し,銅インジウムセレン化物 (CIS) のような装置の高電力変換効率につながります.
科学分野:
- 材料科学
- 太陽光発電
- 半導体化学
背景:
- 高性能光電半導体 (CZTS,CIS,CIGS) のための伝統的な分子インクには,金属前駆体溶解性に関する課題があり,しばしば降水または凝結につながります.
- ディメチル硫化物とチオウレア (TU) を基にした既存のインクには,Ag (I),In (III),Ge (II/IV) のような特定の金属種の制限があります.
研究 の 目的:
- 溶解性と安定性の問題を克服する新しい分子インク配列を開発し,光伏装置で使用されるより広い範囲の金属前駆者を開発する.
- インク内の化学相互作用と溶液処理のための金属カチオン安定化におけるその役割を調査する.
- 高効率の光伏装置の生産における新しいインク化学の有効性を実証する.
主な方法:
- N,N-ジメチルホルマミド (DMF) とチオウレア (TU) を利用して,様々な金属塩化物ルイス酸 (例えば,CuCl,AgCl,InCl3,SnCl4) と安定した酸塩複合体を形成する.
- 塩化物移転とTUを含む安定化メカニズムを解明するために,カロメトリー,ラーマンスペクトロスコーピー,および溶解性実験を使用した.
- 金属の揮発を防ぐため,ルイス塩基性および複合体の安定性に対するTUメチル化の効果を調査した.
主要な成果:
- DMF-TUシステムを使用して,幅広い金属塩化物から高濃度,安定した分子インクを作成しました.
- DMFにおける塩化物の移転とTU複合は,金属カチオンを安定させるための鍵であることが実証された.
- 高い電力変換効率 (CISでは13.4%,CZGTSでは11.0%) と高いオープン回路電圧比 (理論上の限界の67%と63%分) を達成した.
結論:
- DMF-TUの分子インク化学は,溶液処理による高性能光伏材料のための汎用的で効果的なプラットフォームを提供します.
- このアプローチは,CISやCZGTSのような半導体の効率的な堆積を可能にする,重要な前駆体溶解性と安定性の制限を克服します.
- 開発されたインクにより,費用対効果の高い高効率の太陽電池の製造が容易になります.
関連する概念動画
Semiconductors
1.5K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
1.5K
Types of Semiconductors
1.4K
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
1.4K
Chemistry of Carbohydrates
90.6K
Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...
90.6K
Metal-Semiconductor Junctions
994
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
994
Biasing of Metal-Semiconductor Junctions
584
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
584
Molecular Shapes
62.0K
Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
Two regions of electron density in a diatomic...
Two regions of electron density in a diatomic...
62.0K


