ペロブスキート活性層におけるイオン輸送の動力学とその活性層の安定性への影響
Monojit Bag1, Lawrence A Renna1, Ramesh Y Adhikari2
1Department of Chemistry, University of Massachusetts Amherst , Amherst, Massachusetts 01003-9303, United States.
Journal of the American Chemical Society
|September 29, 2015
まとめ
ペロブスキート太陽電池の分解は逆行可能で 減少することができます 赤外線カットオフフィルターなどの 動作条件の変更により 太陽電池の安定性と寿命が向上します
科学分野:
- 材料科学
- 再生可能エネルギー
- 太陽光発電
背景:
- アルキルアンモニアム金属ハリドペロブスキットは効率的で安価な薄膜太陽電池を提供します.
- このペロブスキート製の太陽電池は 太陽光に長時間曝露すると 劣化します
研究 の 目的:
- ペロブスキート太陽電池の分解メカニズムを調査する
- これらの装置の運用安定性と寿命を改善するための方法を特定する.
主な方法:
- 電気化学阻力スペクトロスコーピーは,メチラモニウム (MA),フォームミジニウム (FA),およびMA ((x) FA1-x) 鉛トリヨイド活性層を含むペロブスキート装置を研究するために使用されました.
- 離子拡散と構造変化を分析するために,可変温度EIS研究と粉末X線 difraktion (PXRD) が使用された.
主要な成果:
- FAイオンと比較してMAイオンでより速いイオン拡散が観察されました.
- MAPbI3は,動作温度で構造変化と格子拡張を示した.
- 降解は準逆行性であり,熱で活性化されたイオン輸送と相変化に関連していることが判明しました.
結論:
- MAPbI3の主要な分解メカニズムは,赤外線吸収が促進されたイオン輸送と相移行を含む.
- 赤外線カットオフフィルターや冷却などの操作条件を変更することで,運用寿命と安定性が向上しました.
関連する概念動画
01:30The Electrical Double Layer
167
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
167
01:30Processes at Electrodes
78
The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
78
01:19Ionic Strength: Effects on Chemical Equilibria
3.1K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
3.1K
01:17Pore Transport and Ion-Pair Transport
1.6K
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
1.6K
01:15Resting Potential Decay
6.7K
The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
At rest, the K+ is the main ion that moves across the membrane...
At rest, the K+ is the main ion that moves across the membrane...
6.7K
01:17Ion Exchange
1.5K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.5K