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Presentation transcript:

I have seen this happen !

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Creating a n-p junction on a p-type silicon wafer A n-p junction is a diode and a solar cell It can also be the start of a n-p-n bipolar transistor or a FET transistor Starting with a n-type wafer would create a p-n junction

When creating a doped junction in silicon There are two situations Using a limited source Using a infinite source Each situation has a different mathematical calculation to determine diffusion depth

With an infinite source, the dopant is constantly supplied Example – phosphorus gas continually supplied Clean silicon wafer P-type P P P P P P P P P P P P P P P P P P P P P P P P P P P P P

With an limited source, the dopant has a fixed amount available Example – spin on phosphorus film Clean silicon wafer P-type P P P P P P

For the solar cell being fabricated for this lab The following will apply

Start with a clean p-type silicon wafer Clean silicon wafer P-type

A SiO 2 layer is deposited via PECVD on the backside to prevent backside doping Clean silicon wafer P-type Backside SiO2

Using a liquid n-type phosphorus spin on dopant, a layer of phosphorus is left on the surface Clean silicon wafer P - type Backside SiO2 Spin on phosphorus (n) dopant

To avoid contamination, a separate spinner is used for the spin on dopants This spinner is located in the yellow room closest to the garment change out room Spin at 3 KRPM for 20 seconds. Spin is preset for correct conditions Wafer held with vacuum. Vacuum switch is located on control panel

Liquid dopants are located in the dry box. Use P509 and always check the expiration date Use P509 – expiration date

High temperature tube furnace for C diffusion Furnace #6 is for phosphorus doping only. Do not cross contaminate apparatus and tweezers. Verify correct temperature before using

After C a n-region is created in the silicon. Time and temperature determine the depth of the n doped region P doped silicon Backside SiO2 n doped silicon

An HF etch removes any residual phosphorus on the surface and the backside SiO 2 P-doped n doped

A n/p junction has been formed P-doped n doped

Solid phosphorus sources are available

Liquid POCl 3 with a nitrogen carrier gas is also used as a phosphorus dopant. POCl 3 will form HCl on exposure to moist air or water ! To high temperature furnace tube Nitrogen carrier gas in Constant temperature cooler (20 0 C)

A photo-mask will need to be created using AutoCAD Due to the current limitations on the tester in the clean room, cell size is limited to a maximum of 10 cm 2

Current solar light simulator in Cameron clean room with Keithley 4200 I/V 1 amp max

Example of a photo-mask transparency

AutoCAD dimension drawing must be submitted for approval Dimension Drawing is due in 2 weeks Any pattern for top side conductor is acceptable. Multiple top side conductor patterns preferred Cell size can vary from 2 cm 2 to 10cm 2 Patterns must be in-line to cut with the dicing saw

A new solar cell tester will be available in EPIC with higher current capability (10 amp)

The new tester will provide the capability to test standard size industrial cells 125mm x 125mm cell