Sample Temperature Control via Compressed Air Injection
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Solution Overview
Problem
Conventional solar cell measurement devices face challenges in maintaining a constant temperature, especially for thin film solar cells with thick glass substrates and dye-sensitized solar cells, due to ineffective heat exchange and slow spectral response times, leading to temperature increases during photoelectric characteristic measurements.
Innovation Solution
A device with a direct temperature control method using a cooling unit that injects compressed air and a non-contact thermometer to maintain sample temperature, combined with indirect cooling of the sample stage, ensuring precise temperature control during photoelectric measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an indirect method for controlling sample temperature by controlling sample stage temperature is used, then the measurement device structure is simple, but the temperature control effectiveness is poor for thin film solar cells with thick glass substrates
Solution Approach 1:
The patent introduces a transparent heat dissipation plate as an intermediary between the light source and the thin film solar cell. This plate has high thermal conductivity to conduct heat away from the cell while being transparent to allow light transmission for measurement, thus mediating between the conflicting requirements of light exposure and heat dissipation
Solution Approach 2:
The patent employs forced air convection by blowing cooled air across the sample surface to enhance heat dissipation. This pneumatic approach provides active cooling that directly addresses the poor heat exchange characteristics of thin film solar cells with thick glass substrates
2Stability of the object's composition
If a thin film solar cell with thick glass substrate is measured using indirect cooling, then the sample structure is maintained, but heat exchange between sample stage and sample is ineffective
Solution Approach 1:
The transparent heat dissipation plate serves as a mediator that provides efficient thermal conduction pathways without requiring direct contact with the sample structure. It absorbs excess heat from the cell while remaining optically transparent, thus maintaining sample integrity while improving heat exchange efficiency
Solution Approach 2:
The patent changes the thermal parameters of the measurement system by introducing materials and mechanisms with high thermal conductivity (heat dissipation plate, forced air flow) to compensate for the poor thermal conductivity of the thick glass substrate, thereby improving overall heat exchange efficiency
3Device complexity
If dye-sensitized solar cell measurement is performed with indirect cooling, then the measurement procedure is simple, but the measurement time is long due to slow spectral response time
Solution Approach 1:
The patent implements preliminary cooling measures by pre-cooling the sample and continuously cooling during measurement. This preliminary action reduces the initial temperature and maintains it throughout the extended measurement period required for dye-sensitized solar cells, preventing temperature-induced measurement errors
Solution Approach 2:
The patent employs continuous cooling throughout the extended measurement process rather than intermittent cooling. This continuous action maintains stable temperature conditions throughout the entire measurement period, ensuring measurement accuracy despite the prolonged exposure time required for these slow-response cells
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively maintains sample temperature at Standard Test Conditions (STC) even for challenging cases like thin film solar cells and dye-sensitized solar cells, preventing temperature increases and ensuring accurate measurements.
Implementation Method 1
a cooling unit for cooling the sample by injecting air
Implementation Method 2
a temperature measuring unit having a thermometer to measure the temperature of the sample
Implementation Method 3
an air compressor for generating compressed air
Implementation Method 4
a compressed air cooler connected to the air compressor for cooling the compressed air
Data Source
AI summary
Disclosed herein is a device for controlling a sample temperature during photoelectric measurement of the sample. The device for controlling a sample temperature during photoelectric measurement of the sample includes: a sample stage to which a measurement target sample is fixed; a cooling unit for cooling the sample by injecting air; and a temperature measuring unit having a thermometer that measures a temperature of the sample. The device has an effect of easily controlling the temperature of a measurement target sample by employing a direct control method for a sample temperature, in which air or cooled air is injected to the sample.