Oxygen-layer structure improves lithium-doped silicon solar cells

Technique fabricates hybrid structure utilizing low oxygen silicon as bulk cell material and shallow overlay of silicon with high oxygen concentration

Research, development and pilot production of high output thin silicon solar cells

Work was performed to define and apply processes which could lead to high output from thin (2-8 mils) silicon solar cells. The overall problems are outlined, and two satisfactory process sequences were developed. These sequences led to good output cells in the thickness range to just below 4 mils; although the initial contract scope was reduced, one of these sequences proved capable of operating beyond a pilot line level, to yield good quality 4-6 mil cells of high output

Study of Lithium Doped Solar Cells Quarterly Report

Study of lithium doped solar cell

Some disconnected speculations on slicing silicon

The basic principles for qualifying silicon wafering methods are summarized, and unconventional methods of wafering was discussed. Methods of cleaving analogous to diamond cutting, geological processes employing the expansion of freezing water, and karate chops are touched upon

Development and fabrication of lithium-doped solar cells

The application of contacts and coatings after lithium diffusion provides good electrical output and satisfactory contact adhesion by sintering for short times at temperatures less than the lithium diffusion temperature. High output and repeatability are obtainable from both oxygen-rich and oxygen-lean silicon. These fabrication sequence alterations have led to higher cell output, better appearance, and increased contact strength

Study of lithium doped solar cells

Solar cell properties change from lithium dopin

Study of lithium doped solar cells Final report

Improved cell stability in charged particle environment of space by using lithiu

From Shop floor to top floor. An exploratory study of sustainable progression in the retial sector: the case of Morrisons

There has been increasing political and media attention given to the issue of social mobility in recent times. The interest has been sparked by research which suggests that social mobility may have stalled or even declined in the UK during the post-war period. Various factors have been identified as inhibiting social mobility including early years experiences in the home and at school, education and health along with area based influences. Employment and labour market experiences are also key factors contributing to social mobility with the importance of ‘getting a job’ and ‘sustainable progression’ increasingly recognised as an important means of improving social mobility. There now appears consensus that occupational mobility and career development is a key factor in overcoming social mobility, and the extent to which organisations develop pathways and support careers is a critical element in pursuing social mobility. This exploratory study has been commissioned by Morrisons to investigate the factors which impact on progression in the workplace and the effect of these on the social mobility of research participants. The study adopts the framework of ‘career development’ as a construct to explore sustainable progression, drawing on the employment and labour market experiences of employees at Morrisons who, having started on the ‘shop floor’ have progressed to senior management levels in the company. The study is based on their ‘life stories’ to identify the key factors associated with a successful career at Morrisons

Development of low cost contacts to silicon solar cells

A copper based contact system using plated Pd-Cr-Cu was developed. Good cells were made but cells degraded under low temperature (300 C) heat treatments. The degradation was identified as copper migration into the cells junction region. A paper study was conducted to find a proper barrier to the copper migration problem. Nickel was identified as the best candidate barrier and this was verified in a heat treatment study using evaporated metal layers. An electroless nickel solution was substituted for the electroless chromium solution in the original process

Recent developments in thin silicon solar cells

Fifty micron thick cells 2x4 sq cm area with coplanar back contacts were made with good yield, and with output equivalent to conventional top/bottom contact cells of the same thickness. A wraparound junction (WAJ) design was selected, and used successfully. The low alpha cells delivered were all above 12%, the average efficiency was 13% and the best was 14%. The overall yield was 35 to 40%, comparable to that for conventional 50 micron cells. The process sequence was moderately complex, but showed good reproducibility. The CBC cells performed wall under several important environmental tests. High alpha CBC cells were made, with about 1% increase in conversion efficiency. The most important design criteria were the choice of back surface N+ and P+ areas