applications of photovoltaic technologies l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Applications of Photovoltaic Technologies PowerPoint Presentation
Download Presentation
Applications of Photovoltaic Technologies

Loading in 2 Seconds...

play fullscreen
1 / 22

Applications of Photovoltaic Technologies - PowerPoint PPT Presentation


  • 113 Views
  • Uploaded on

Applications of Photovoltaic Technologies. Solar Cell-structure. Busbar. Antireflection coating. Fingers. Emitter. Antireflection texturing (grid pattern). Base. Rear contact. A solar cell is a P-N junction device

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Applications of Photovoltaic Technologies' - teneil


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
solar cell structure
Solar Cell-structure

Busbar

Antireflection coating

Fingers

Emitter

Antireflection texturing

(grid pattern)

Base

Rear contact

  • A solar cell is a P-N junction device
  • Light shining on the solar cell produces both a current and a voltage to generate electric power.
illumination sources
Illumination Sources

Table: Solar simulator classification according to IEC 60904-9 Ed. 2.0.

no resistive losses
No Resistive Losses

IL

V

ID

Solar Cell model

  • The I-V relation is given as:

I

Io-dark saturation current ,

IL-light generated current. ,

n -ideality factor .

solar cell i v curve
Solar Cell I-V Curve

I

  • Under illumination solar cell can be operated in the fourth quadrant corresponding to delivering power to the external circuit

I (diffu.)

V

I0

  • A P-N junction in the dark consumes power, as it can be operated in 1st or 3rd quadrant
  • Effect of solar radiation on the I-V curve
  • Current in the illuminated solar cell is negative, flows against the conventional direction of a forward diode
solar cell i v curve7
Solar Cell I-V Curve

I

Isc

Pm

Im

V

Vm

Voc

  • Solar cell parameters
  • Voc - open circuit voltage,
  • Isc - short circuit current,
  • Pm - maximum power point
  • Im, Vm – current and voltage
  • at maximum power point
  • FF – fill factor
  • η – efficiency
  • Rs – series resistance
  • Rsh – shunt resistance

Usual I-V plot of solar cell – Current is shown on positive y -axis

short circuit current i sc
Short-Circuit Current, Isc

I

Pm

X

Im

Vm

Voc

  • The short-circuit current is the current through the solar cell when the voltage across the solar cell is zero (i.e., when the solar cell is short circuited).
  • The short-circuit current is due to the generation and collection of light-generated carriers.
  • The short-circuit current is the largest current which may be drawn from the solar cell.

At V=0  I= -IL= Isc

open circuit voltage v oc
Open Circuit Voltage: Voc

I

Isc

Pm

Im

X

Vm

Voc

  • The open-circuit voltage, Voc, is the maximum voltage available from a solar cell, and this occurs at zero current.
  • The open-circuit voltage corresponds to the amount of forward bias on the solar cell junction due to illumination.

At I=0  V= Voc

maximum power p m
Maximum power: Pm

Pm

X

Power

I

Isc

  • Power out of a solar cell increases with voltage, reaches a maximum (Pm) and then decreases again.

Im

Voc

Vm

Pm = Im x Vm

  • Remember we get DC power from a solar cell
fill factor ff
Fill Factor: FF

Ideal diode curve

Pm

I

Isc

  • The FF is defined as the ratio of the maximum power from the actual solar cell to the maximum power from a ideal solar cell

Im

Vm

Voc

  • Graphically, the FF is a measure of the "squareness" of the solar cell
efficiency
Efficiency: η

I

Isc

Pm

Im

X

Power

Voc

Vm

  • Efficiency is defined as the ratio of energy output from the solar cell to input energy from the sun.
  • The efficiency is the most commonly used parameter to compare the performance of one solar cell to another.
  • Efficiency of a cell also depends on the solar spectrum, intensity of sunlight and the temperature of the solar cell.
effect of r s and ff
Effect of Rs and FF

Isc

Medium Rs

Large Rs

I

Voc

V

Characteristic resistance, Rch

Normalized series resistance, rs

  • Slope of the I-V curve near Voc gives indication about Rs
  • Effect of series resistance on the FF and maximum power
effect of r sh on ff
Effect of Rsh on FF

Isc

Medium Rsh

I

Voc

V

  • Slope of the I-V curve near Isc gives indication about Rsh

Normalized shunt resistance, rsh

  • Effect of series resistance on the FF and maximum power
sciencetech 150w
ScienceTech 150W太陽光模擬器
  • 機型:ScienceTech 150W太陽光模擬器與IV 量測系統
  • Substrate:> 5.0 cm x 5.0 cm
  • 可量測範圍:0.1V to 1.0V
  • I-V曲線中之各項性能參數:開路電壓(Voc)、短路電

流(Isc)、最大輸出功率(Pmp)、並自動計算填充因子(fill factor) 、太陽電池效率(efficiency)

  • 具有溫控功25℃
quantum efficiency
Quantum Efficiency

Quantum efficiency (Q.E.) is the ratio of the number of carriers collected by the solar cell to the number of photons of a given energy incident on the solar cell.

Internal quantum efficiency (IQE) refers to the efficiency with which photons that are not reflected or transmitted out of the cell can generate collectable carriers.

External quantum efficiency (EQE) of a silicon solar cell includes the effect of optical losses such as transmission and reflection.