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Related Concept Videos

Weak Base Solutions03:21

Weak Base Solutions

24.9K
Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
24.9K
Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

35.4K
A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
35.4K
Solution Composition During Acid/Base Titrations01:17

Solution Composition During Acid/Base Titrations

1.5K
The titration of a weak acid with a strong base results in the formation of water and the conjugate base of the acid. For instance, titrating acetic acid with sodium hydroxide leads to the formation of water and sodium acetate. A solution of acetic acid and sodium acetate constitutes a buffer whose relative concentration at different stages of the titration is indicated by the α values, which represent percentages of the weak acid and its conjugate base.
The α0 and α1 values...
1.5K
Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

Leveling Effect and Non-Aqueous Acid-Base Solutions

9.4K
This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
9.4K
Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

726
Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
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Enthalpy of Solution02:39

Enthalpy of Solution

30.2K
There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution:
30.2K

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Related Experiment Video

Updated: Jan 25, 2026

In Situ Monitoring of the Accelerated Performance Degradation of Solar Cells and Modules: A Case Study for CuIn,GaSe2 Solar Cells
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Defect Analysis of Solution-Based Process CIGS Thin-Film Solar Cells Using Technology Computer-Aided Design.

Sangah Lee1, Jaesung Lee1, Yoojeong Lee1

  • 1School of Electronics and Information Engineering, Korea Aerospace University, Goyang-City, Gyeonggi-do 412-791, Republic of Korea.

Journal of Nanoscience and Nanotechnology
|April 28, 2019
PubMed
Summary

Defect modeling in Copper Indium Gallium Sulfur Selenide (CIGS) solar cells reveals that interface defects are more critical than bulk defects. Improving fabrication processes for both CIGS and the Cadmium Sulfide buffer layer is key to enhancing cell efficiency.

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Fabrication of Robust Nanoscale Contact between a Silver Nanowire Electrode and CdS Buffer Layer in CuIn,GaSe2 Thin-film Solar Cells
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Fabrication of Robust Nanoscale Contact between a Silver Nanowire Electrode and CdS Buffer Layer in CuIn,GaSe2 Thin-film Solar Cells
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Solution-Processed "Silver-Bismuth-Iodine" Ternary Thin Films for Lead-Free Photovoltaic Absorbers
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Area of Science:

  • Materials Science
  • Renewable Energy
  • Semiconductor Physics

Background:

  • Copper Indium Gallium Sulfur Selenide (Cu(In1-xGax)SeS, CIGS) thin film solar cells offer a promising avenue for renewable energy.
  • Solution-based fabrication processes are being explored to reduce manufacturing costs.
  • Understanding and mitigating defects are crucial for improving solar cell performance.

Purpose of the Study:

  • To model and analyze defects in solution-processed CIGS thin film solar cells.
  • To compare the impact of bulk CIGS defects versus interface defects on device performance.
  • To identify key areas for process improvement to enhance solar cell efficiency.

Main Methods:

  • Fabrication of CIGS thin film solar cells using a solution-based process.
  • Computer-aided design (CAD) for defect modeling.
  • Analysis of external quantum efficiency (EQE) and current density-voltage (J-V) characteristics.
  • Simulation of defect behavior within CIGS grains and at the CdS/CIGS interface.

Main Results:

  • Defects at the Cadmium Sulfide (CdS)/CIGS interface (~7 × 10^18 cm^-3) were found to be more detrimental than defects within the CIGS layer (~2 × 10^15 cm^-3).
  • Simulated defect models showed good agreement with experimental measurements.
  • Grain size variations in CIGS layers influenced defect distribution, but interface defects dominated performance limitations.

Conclusions:

  • The CdS/CIGS interface quality is a critical factor limiting the efficiency of solution-processed CIGS solar cells.
  • Improvements in both CIGS layer formation and CdS buffer layer deposition are necessary for higher efficiency.
  • Numerical defect modeling provides valuable insights for optimizing fabrication processes and device structures for high-performance CIGS solar cells.