Solar screen-printing technology

First post by: www.itsbattery.com
1. Outlined. Medium in Compaq Laptop Battery the semiconductor, CdS (vulcanized steel) with 2.42eV (electron volts) of the band gap (band gap: Solid Medium not allowed to have the electronic energy levels of the energy range), available through most of the sunlight, are easy to form a low - resistance characteristics, suitable for different mating type solar cell for our dell inspiron 9300 battery, the solar cell window material. In addition, CdTe (cadmium telluride) is the band gap of about 1.4eV direct migration semiconductor, absorption of sunlight as the materials are most suitable.

Following on the screen printing of CdS / CdTe solar cell structure, manufacturing methods, performance and features to do one easy introduction.

2. Construction and manufacturing methods. In 5 × 10cm2 glass substrate to do the screen printing system CdS / CdTe solar cells such as with the Laptop Battery. Sunlight from the glass substrate into the goal, in the glass substrate to form the whole surface n-CdS sintered film, the n-CdS sintered film, the formation of P-CdTe sintered film. P-type CdS and n-type CdTe sintered film formed between P-n junction. In C on the formation of Ag electrode as a positive electrode; in CdS to form part of (Ag + In) electrode as negative electrode, can constitute a solar cell components.
Through the formation of screen printing saw like five layers of solar cells, each have corresponding printing Flux, Flux composition such as shown in Table 4-33.

This solar cell is characterized by semiconductor (CdS, CdTe) and the electrode (C, Ag + In) easy to repeat as long as screen printing, in the ring furnace for firing can be formed. And there are the code it fits for: dell laptop battery, Compaq Presario 1800 Battery .
Table 4-33 Printing component Cds Flux Flux

The main agent CdS powder (5N, size 2 ~ 3μm)
Auxiliary binder CdCl2, powder (9.1wt%) propylene, ethylene glycol (moderate)

Continued Table CdTe flux
The main agent of cadmium powder (5N) tellurium powder (6N)
Auxiliary binder CdCl2 (0.5wt%) propylene, ethylene glycol (moderate)

Electrode Flux
C electrode Copper copper 50p.p.m Flux
Ag + In electrode market indium tin flux powder (20wt%)
Ag electrodes sold in the markets, silver flux
3. Capability. Such as summarized in Compaq Presario 700 Battery Table 4-34, the solar cell area to increase non-compliance can be a very high efficiency, very good performance. In addition, such a solar cell is to use the legal system into a screen-printing, so by changing the printing pattern can be formed layer-type, and easy access to high-voltage solar cells, which for our dell batteries, such as dell g5260 and dell g5266. Table of large area components are in the thickness of 0.13cm, an area of 30 × 30cm2 of heat-resistant glass substrate, the four lines of nine units of all components connect directly with the solar cell. To a substrate made of a module has been omitted from the wiring between component processes, in materials, manufacturing, module at all stages of the whole group can reduce costs. If you realize a low-cost solar cell modules, the use of solar cells will be expanded to all fields.

Table 4-34 Printing CdS / CdTe solar cell performance

Project components in a small area of large area components components
Size (dm) 4.6 × 0.17 10 × 10 (substrate) 30 × 30 (substrate)
Area (cm2) 0.78 100 900
Generating area (cm2) 0.78 64 559
Open voltage V oc (V) 0.75 1.54 27.5
Short-circuit current Isc-Compaq Presario 900 Battery (A) 0.022 0.79 0.35
Curve of the rate of FF 0.61 0.54 0.51
Maximum output Wmax (W) 0.01 0.65 4.84
Wmax when voltage Vmax (V) 0.57 1.04 18.0
Wmax when current Imax (A) 0.17 0.63 0.27
Practical conversion efficiency ηp (%) - 6.5 5.4
Theoretical conversion-inspiron 8200 battery efficiency of η1 (%) 12.8 10.2 8.7
The number of units of component (a) 1 2 36