Loading...

Messages

Proposals

Stuck in your homework and missing deadline? Get urgent help in $10/Page with 24 hours deadline

Get Urgent Writing Help In Your Essays, Assignments, Homeworks, Dissertation, Thesis Or Coursework & Achieve A+ Grades.

Privacy Guaranteed - 100% Plagiarism Free Writing - Free Turnitin Report - Professional And Experienced Writers - 24/7 Online Support

Homework screen printing

28/03/2021 Client: saad24vbs Deadline: 2 Day

School of PV and RE Engineering

Lecture 8 – Screen Printing and Rear Al Metallisation

Andre Augusto

Copyright UNSW Dr Alison Lennon 1-2

Lecture Overview

1. Metallisation Overview 2. Screen-Printing And Drying 3. Rear Surface Al Electrode 4. Front Surface Ag Grid Electrode 5. Revolutions in Screen Printed Solar Cell Industry 6. Localised Rear Contacts 7. Future of SP Metallisation

Today

Copyright UNSW Dr Alison Lennon 1-3

Screen-Printed Si Solar Cells Saw-damage removal

Texturing

Emitter diffusion

PSG Removal

Edge isolation

SiNx antireflection coating

Al rear SP

Ag front contact SP

Co-firing

Copyright UNSW Dr Alison Lennon 1-4

• Metal electrodes enable current to be collected from cells

• Aluminium (Al) metal paste is used for the rear surface to make electrical connection to the rear p-type wafer. The Al usually covers most of the rear surface.

• Silver (Ag) metal paste is used for the front surface to make connection to the front n-type diffused emitter. The Ag is usually patterned with an “H” shaped grid pattern.

• Screen printing is used to place the metal onto the surfaces. Thus, the metal is initially formed into a viscous liquid “paste” that can be screen printed.

• A “firing” process then sinters and alloys the metal paste together and to the silicon wafer so that a low- resistance, “ohmic” contact is formed with good adhesion to the silicon wafer

• The “firing” process also forms an Al-Si alloy at the rear surface that is beneficial in reducing recombination at the rear surface (so-called “Back Surface Field”)

Metallisation Overview

Screen printing screen “H” grid pattern of front electrode

Copyright UNSW Dr Alison Lennon 1-5

• Current practice is to screen print an aluminium (Al) paste on the rear surface and then fire this paste so that it forms an Al-Si alloy at the rear surface

• The Al-Si alloy functions to (1) dissolve enough silicon to wipe out any n- diffused layers on the rear surface, (2) make electrical contact to the rear of the p-type wafer and (3) form a p++ heavily doped layer at the rear that serves as a minority carrier Back Surface Field (BSF).

n+ ~ 0.3-0.5 um

p ~ 170 um

p++ ~ 8 um

Al Back Surface Field (BSF)

n-diffused layer

Si wafer

p++ Al-Si alloy layer

Copyright UNSW Dr Alison Lennon 1-6

• The BSF has an associated built-in electric field (that works similarly to the n-p junction on the front surface, albeit to a smaller degree): Ø Repels electron that impinge on the rear surface; and therefore Ø Reduces recombination at the rear surface.

• Lower recombination à Higher VOC • Higher rear collection probability (of long wavelength light) à Higher JSC

n+ ~ 0.3-0.5 um

Homework is Completed By:

Writer Writer Name Amount Client Comments & Rating
Instant Homework Helper

ONLINE

Instant Homework Helper

$36

She helped me in last minute in a very reasonable price. She is a lifesaver, I got A+ grade in my homework, I will surely hire her again for my next assignments, Thumbs Up!

Order & Get This Solution Within 3 Hours in $25/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 3 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 6 Hours in $20/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 6 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 12 Hours in $15/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 12 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

6 writers have sent their proposals to do this homework:

Solutions Store
Unique Academic Solutions
Accounting Homework Help
Engineering Solutions
Coursework Help Online
Top Essay Tutor
Writer Writer Name Offer Chat
Solutions Store

ONLINE

Solutions Store

I will cover all the points which you have mentioned in your project details.

$43 Chat With Writer
Unique Academic Solutions

ONLINE

Unique Academic Solutions

I am known as Unrivaled Quality, Written to Standard, providing Plagiarism-free woork, and Always on Time

$29 Chat With Writer
Accounting Homework Help

ONLINE

Accounting Homework Help

You can award me any time as I am ready to start your project curiously. Waiting for your positive response. Thank you!

$40 Chat With Writer
Engineering Solutions

ONLINE

Engineering Solutions

I will cover all the points which you have mentioned in your project details.

$70 Chat With Writer
Coursework Help Online

ONLINE

Coursework Help Online

Hello, I an ranked top 10 freelancers in academic and contents writing. I can write and updated your personal statement with great quality and free of plagiarism

$70 Chat With Writer
Top Essay Tutor

ONLINE

Top Essay Tutor

I am known as Unrivaled Quality, Written to Standard, providing Plagiarism-free woork, and Always on Time

$41 Chat With Writer

Let our expert academic writers to help you in achieving a+ grades in your homework, assignment, quiz or exam.

Similar Homework Questions

Assignment: Practicum – Week 2 Journal Entry - Food a fact of life explore food - Castle hill x ray department - Ezproxy liberty 2048 login - Precision and Passion in Nursing Writing Services - Hsco 509 case study - Yeast two hybrid library - Traditional methods of harvesting - How to calculate fte for 12 hour shifts - Dsm 5 diagnosis decision tree - How much force to lift an object - United States History: Stamp Act Congress Resolutions - The "corporate athlete approach" to stress is - Cibse commissioning code l - Projects Algorithm - Fundamentals of effective communication in the workplace - Networking - Celebrities with central auditory processing disorder - C# windows form application exercises - Apply porter's value chain model to costco - 3.85 miles in km - What are the indices for the directions indicated - How to play scene it dvd game - Zappos case study questions and answers - Investment corporation of bangladesh branches - Strategic management rothaermel 4th edition pdf - Discussion paper with 2 responses - In regards to techniques, existential practitioners believe: - Nambour swap meet 2020 - Closure in lesson plan - Discussion - Lab submission 5.6 1 warm up parsing strings java - Leadership Applications CRJ-565-MCOL3 - Building a smarter planet - 3 bit binary counter jk flip flop - Abc net au austory - How is a firm's task environment different from its general environment? - What is advertising execution - Chapter 2 descriptive statistics 2.2 answers - Ggggo - Helping skills facilitating exploration insight and action 4th ed pdf - How to convert babylonian numerals to hindu arabic - What does parallax mean in science - Albert einstein great grandchildren - Glencoe virtual lab plant growth - Safety root cause analysis template - Citizen kane low angle shots - Persuasive outline on abortion - Walden university mission statement - 51 headland road castle cove - Project management simulation scenario c - Case# 3 Outcome Canna - Convert amps to wattage - Calibrating a spectroscope - Doctral program (IT) - Lee v lee's air farming - Nobody gets in to see the wizard meaning - Match each term with the correct definition - Blowout and non blowout pipette - David hume moral distinctions not derived from reason - Facial recognition software its reliability effectiveness and admissibility - Best sentence starters for essays - Nursing - Sabre red download for windows 7 - Pos 2041 - Outline business case prince2 - 13 businesses with brilliant global marketing strategies - Project - Discussion - Seed labs buffer overflow vulnerability lab - I can feel the love can you feel it to - Gcf of 180 and 252 - Which gas is easily liquefied - High firs primary school - The true luxury global consumer insight - Discussion on Risk Challenges - Http www tnellen com westside harrison pdf - Different southern american accents - Lexical analyzer generator lex - Organizational Paper Review - Classic vs contemporary literature - Lcm hcf and gcd - Assignment 2 - ZARA - Informative speech on abortion outline - If dna triplets are atg cgt the mrna codons are - Aussie batteries and solar maroochydore - In ______________ on their first missionary journey, paul and barnabas were mistaken for gods. - The malleus and incus develop from this pharyngeal arch cartilage: - The glass cage nicholas carr chapter summary - For what would a patient of german descent use cloves? - Hrm599 assign 4 slides - Terry barrett interpreting art pdf - Jcb 3cx fuse box diagram - Chapter 2 conceptual framework for financial reporting - What is regenerated in fermentation - The need for alignment of corporate objectives and expat's assignment - Evidence Based Practice Research Components - How to configure static route packet tracer - Enterprise Risk management