Circuit diagram
(Click figure to enlarge)
Wiring diagram A
(Click figure to enlarge)
Wiring diagram B
(Click figure to enlarge)
Diffusion current vs junction voltage
(Click graph to enlarge)
Junction voltage vs temperature
(Click graph to enlarge)
Features
Investigates PN junction properties
Facilitates Boltzmann constant measurement
Practical applications in electronics and physics
Introduction
Understanding the physical properties of a PN junction is fundamental to general physics, semiconductor physics, and electronics. This apparatus provides a practical approach to measuring the characteristics of a PN junction and determining the Boltzmann constant. Additionally, it serves as a valuable tool for studying weak current measurement techniques.
Equipped with a thermostat controller and a platinum resistance thermometric bridge, this apparatus enables users to measure the relationship between PN junction voltage and thermodynamic temperature. Furthermore, it helps calculate temperature sensor sensitivity and approximate the forbidden energy bandgap of silicon at absolute zero (0 K).
Designed specifically for college and university-level general physics education, this instrument introduces foundational concepts in semiconductor physics and experimental methods.
Using this instrument, the following experiments can be performed:
1. Measure PN junction diffusion current versus junction voltage, and acquire Boltzmann constant
2. Construct a current-voltage converter using operational amplifiers for measuring weak current
3. Measure PN junction voltage versus temperature, and acquire the sensitivity of junction voltage with temperature
4. Obtain prohibited bandwidth of silicon material at 0 K approximately
5. Measure temperature and electrical resistance using platinum resistance and DC bridge method
The instruction manual contains experimental configurations, principles, step-by-step instructions, and examples of experiment results. Please click Experiment Theory and Contents to find more information about this apparatus.
Specifications
| Description | Specifications |
| DC power supply | 2 sets, 0 ~ 15 V and 0 ~ 1.5 V, adjustable |
| Digital voltmeter | 2 sets, 3-1/2 digit, range: 0 ~ 2 V; 4-1/2 digit, range: 0 ~ 20 V |
| Temperature controller | range: room temperature to 80 °C, resolution: 0.1 °C |
| Temperature sensor | Platinum resistance thermometric bridge (R0=100.00 Ω at 0 °C) |
Part List
| Description | Qty |
| Main unit | 2 |
| TIP31 transistor | 1 |
| Thermostat | 1 |
| C9013 transistor | 1 |
| LF356 Op-Amp | 2 |
| Jumper wire | 25 |
| Signal cable | 1 |
| Instruction manual | 1 |
Circuit diagram
(Click figure to enlarge)
Wiring diagram A
(Click figure to enlarge)
Wiring diagram B
(Click figure to enlarge)
Diffusion current vs junction voltage
(Click graph to enlarge)
Junction voltage vs temperature
(Click graph to enlarge)
