Exploitation of Quantum Photoeffects in Reducing Microscopic Defects and Processing Cycle Time in Advanced Rapid Thermal Processing

1997 ◽  
Vol 470 ◽  
Author(s):  
V. Vedagarbha ◽  
R. Singh ◽  
D. Ratakonda ◽  
L. Vedula ◽  
A. Rohatgi ◽  
...  
Keyword(s):  
Cycle Time ◽  
Thermal Processing ◽  
Ohmic Contacts ◽  
Schottky Diodes ◽  
Rapid Thermal Processing ◽  
Processing Technique ◽  
Back Surface ◽  
Back Surface Field ◽  
Surface Field ◽  
Low Thermal Budget

ABSTRACTRapid thermal processing is fast emerging as a vital low thermal budget processing technique. Use of photons of wavelengths less than 800 nm in conjunction with infrared and visible photons in RTP resulted in the reduction of microscopic defects and processing time. Screen printed back surface field (BSF) contacts and ohmic contacts which are an integral part of solar cells were processed and Schottky barrier diodes were made. Cycle time was reduced from 172 see's to 108 see's in the case of back surface field contacts and from 162 see's to 122 see's for the ohmic contacts. The Schottky diodes were characterized for electrical data. The structural properties of the metal silicon interface have direct correlation with the electrical properties of the device.

scholarly journals Optimization of Laser Fired Contact Process for the Formation of an Al-BSF Layer

2021 ◽  
Vol 11 (6) ◽  
pp. 2689
Author(s):  
Jeong Eun Park ◽  
Won Seok Choi ◽  
Donggun Lim
Keyword(s):  
Laser Power ◽  
Ohmic Contacts ◽  
Contact Process ◽  
Laser Frequency ◽  
Back Surface ◽  
Back Surface Field ◽  
Performance Variables ◽  
Laser Process ◽  
Surface Field ◽  
Analysis Of Performance

The back-surface field (BSF) layer obtained through the laser fired contact (LFC) process is the key to increasing the efficiency of solar cells. In this paper, we studied the optimization of LFC process parameters—focusing on laser frequency, influence, and speed—to achieve good ohmic contacts, and to reduce the heat-affected zone (HAZ). As frequency increases, interactions between the laser and particles increase, with the particles becoming overly heated. This generates the thermal effect, in which heat is transferred to particles not directly affected by the laser—resulting in the HAZ becoming wider and deeper. Under different laser power conditions, depths of approximately 18 and 8.3 μm were observed at laser speeds of 10 and 100 mm/s, respectively. This analysis of performance variables allowed us to identify those best suited to forming an Al-BSF layer approximately 1.2 μm thick, which resulted in the best LFC procedure while minimizing the HAZ area. HAZ size was minimized at a frequency of 400 kHz, using 5 W laser power, and a laser speed of 100 mm/s, while the best cell characteristics were obtained using a laser pitch of 500 μm and a single laser process.

Rapid Thermal Dopants Diffusion and Surface Passivation for Silicon Solar Cells Applications

1996 ◽  
Vol 429 ◽  
Author(s):  
Abdelilah Slaoui ◽  
Aziz Lachiq ◽  
Laurent Ventura ◽  
Jean Claude Muller
Keyword(s):  
Solar Cells ◽  
Thermal Processing ◽  
Surface Passivation ◽  
Rapid Thermal Processing ◽  
Thermal Exposure ◽  
Silicon Solar Cells ◽  
Back Surface ◽  
Simultaneous Formation ◽  
Time Processing ◽  
Surface Field

AbstractLimiting thermal exposure time using Rapid Thermal Processing (RTP) is now emerging as a promising simplified process for manufacturing of terrestrial solar cells in a continuous way. In this work, we present results on simultaneous formation of emitter, back-surface field and surface passivation in a single rapid thermal cycle. Spin-on dopants (SOD) solutions are used as dopant sources. Optimal emitter profiles, low sheet resistances and high gettering effect are reached. The residual SOD film is used as a surface passivation layer. Solar cells with efficiencies in the range 10 – 14 % are obtained depending on temperature and time processing.

scholarly journals Numerical Investigation of Graphene as a Back Surface Field Layer on the Performance of Cadmium Telluride Solar Cell

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3275
Author(s):  
Devendra KC ◽  
Deb Kumar Shah ◽  
M. Shaheer Akhtar ◽  
Mira Park ◽  
Chong Yeal Kim ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Doping Concentration ◽  
Carrier Lifetime ◽  
Short Circuit ◽  
Back Surface ◽  
Back Surface Field ◽  
Cdte Solar Cell ◽  
Cdte Solar Cells ◽  
Surface Field

This paper numerically explores the possibility of ultrathin layering and high efficiency of graphene as a back surface field (BSF) based on a CdTe solar cell by Personal computer one-dimensional (PC1D) simulation. CdTe solar cells have been characterized and studied by varying the carrier lifetime, doping concentration, thickness, and bandgap of the graphene layer. With simulation results, the highest short-circuit current (Isc = 2.09 A), power conversion efficiency (h = 15%), and quantum efficiency (QE ~ 85%) were achieved at a carrier lifetime of 1 × 103 ms and a doping concentration of 1 × 1017 cm−3 of graphene as a BSF layer-based CdTe solar cell. The thickness of the graphene BSF layer (1 mm) was proven the ultrathin, optimal, and obtainable for the fabrication of high-performance CdTe solar cells, confirming the suitability of graphene material as a BSF. This simulation confirmed that a CdTe solar cell with the proposed graphene as the BSF layer might be highly efficient with optimized parameters for fabrication.

Screen-printed n-type Si solar cells with laser-doped selective back surface field

Solar Energy ◽  
2021 ◽  
Vol 220 ◽  
pp. 211-216
Author(s):  
H.P. Yin ◽  
W.S. Tang ◽  
J.B. Zhang ◽  
W. Shan ◽  
X.M. Huang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Back Surface ◽  
Back Surface Field ◽  
Si Solar Cells ◽  
Surface Field ◽  
Screen Printed

scholarly journals Enabling bifacial thin film devices by developing a back surface field using CuxAlOy

Nano Energy ◽  
2021 ◽  
Vol 83 ◽  
pp. 105827
Author(s):  
Kamala Khanal Subedi ◽  
Adam B. Phillips ◽  
Niraj Shrestha ◽  
Fadhil K. Alfadhili ◽  
Anna Osella ◽  
...  
Keyword(s):  
Thin Film ◽  
Back Surface ◽  
Back Surface Field ◽  
Surface Field ◽  
Thin Film Devices

Effects of buffer layer and back-surface field on MBE-grown InGaAsP/InGaAs solar cells

2016 ◽  
Vol 55 (2) ◽  
pp. 022301 ◽  
Author(s):  
Yuanyuan Wu ◽  
Lian Ji ◽  
Pai Dai ◽  
Ming Tan ◽  
Shulong Lu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Buffer Layer ◽  
Back Surface ◽  
Back Surface Field ◽  
Surface Field

Back surface field and vertical solar cell

1982 ◽  
Vol 53 (4) ◽  
pp. 3333-3334 ◽  
Author(s):  
Yu‐Tung Yang
Keyword(s):  
Solar Cell ◽  
Back Surface ◽  
Back Surface Field ◽  
Surface Field
Sign in / Sign up

Export Citation Format

Share Document