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

Metallization problems with concentrator cells

Cells used with concentrators have similar contact requirements to other cells, but operation at high intensity imposes more than the usual demands on the metallization. Overall contact requirements are listed and concentrator cell requirements are discussed

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

Research, Development and Fabrication of Lithium Solar Cells

This report continues studies on cells made with low temperature (<400degC) single-cycle, lithium diffusion schedules. Measurements of concentration of lithium at the back surface showed that C(sub S) changes with time consisting of a build-up to a maximum value (above 10(exp 17) cm(exp -3)) with gradual decrease at longer diffusion times. Using the estimated C(sub S) values, theoretical lithium profiles were calculated. The calculated concentration near the PN junction was higher than those measured by the capacitance voltage (C-V) technique. The calculated concentration gradients were one-seventh of those measured by C-V methods. Both the concentration and its gradient were proportional to C(sub S). Estimates of C(sub S) obtained by extrapolating from C-V measured values of concentration and gradient near the PN junction, showed a decrease in C(sub S) for longer diffusion times. This fact supported the trend observed in Shipment C-13, where,, at longer times, the spread in values of V(sub oc), lithium concentration, and gradient became greater. The general conclusion was that the I-V characteristics were well controlled, with good cell output, but for longer diffusion times the lithium concentration gradient could have wider spread. The work described has led to greater insight into the lithium distribution dependence on the surface conditions. The surface conditions could be changed by varying the method used to apply lithium. Vacuum evaporation of lithium shows promise, and another exhaustive test of this method is in progress. Shipment C-13 is summarized, and the succeeding lots (C-14, C-15) are described. It is felt that improved monitoring of cell properties is at hand, and that the control of cell fabrication processes has advanced to where the effects of subtle differences in lithium distribution can now be seen. Evaluation is continuing on the best method to scale up the fabrication steps. A different sequence of fabrication is planned for Shipments C-14 and C-15

Study of lithium doped solar cells Final report

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

Inventory’s paper assembly: fierce sociology, sovereignty and self-organisation in London’s small press publishing scene 1995 to 2005

This study attempts to deliver an intellectual history of the journal Inventory and its place within theories of knowledge, publishing, artistic practice, ethnography, politics and critical theory. The initial movement of the thesis, Chapter 1, establishes Inventory’s formal structure as a journal. Chapter 2 establishes the presuppositions and models for the use of a journal or magazine as a platform for heterodox cultural practice and inquiry. The study then follows Inventory’s proposition of a method derived from the fusion of the heterogeneous sociology of Georges Bataille and his circle in Chapter 3; and the speculative aesthetic theory, and ‘anthropological materialism’, of Walter Benjamin in Chapter 4. In Chapters 3 and 4 Inventory’s ‘constellation of methods’: surrealism – as a mode of research and publishing, rather than as a visual art – meets ethnography, the study of the culture of all humankind on a common plane of praxis. This partisan reappropriation of surrealist and ethnographic method is shown to generate a complex para-academic publishing and research project, one which has a relation to, but ultimately exceeds, contemporary theories of either the ‘artist as anthropologist’ (Joseph Kosuth), ‘ethnographic surrealism’ (James Clifford) or ‘the artist as ethnographer’ (Hal Foster). Chapter 5 discusses the journal’s presentation as writing or literature and the relation between the whole and its parts developed philosophically in the previous chapters in terms of the form of the journal itself as a constellation and the writing it cohered around and presented. This chapter therefore also discusses the development of mental or perceptual spaces of resistance to the restructuring of space discusses in the preceding chapter through experimental writing and publishing (artist projects, found texts, visionary or prophetic texts). The study subsequently situates the intellectual and cultural productions of Inventory journal within the dynamic social, political and cultural context of London in the 1990s and 2000s. This contextualisation is achieved by engagement, in Chapter 6, with a specific site of dissemination for Inventory, Info Centre (1999-2000), through it the journal associated with parallel cultural and political practices of self-publishing and self-organisation by artists, writers and activists in the late-1990s and 2000s. I argue that these practices sought to challenge existing forms of organisation, knowledge production, cultural and social totality during a period of capitalist restructuring of work, social reproduction, the urban environment and the institutions of art. The opposition to this restructuring and its re-colonisation of space in London is conceived both in terms of the production of critical commentaries on the production of space in the city (urban sociology, psychogeography); contesting established cultural histories (e.g. of surrealism, the Situationist International and conceptual art); creation of small autonomous institutions and development of mental or perceptual spaces of resistance through experimental writing and publishing. I argue that Inventory itself takes on a ‘self-institutional’ form in this situation, and as journal provides a space and singular spaces (in terms of individual contributions) for independent critical thinking (artist projects, urban sociology, found texts, visionary or prophetic texts). Chapter 7 presents the journal’s contribution to critical accounts of practices and legacies of urbanism (housing, city planning, spatial practices and government) in London in the post-war period and during the period of the journal’s publication (1995-2005). The journal’s identification of, and opposition to, forces restructuring London spatially during this period is conceived in terms of the production of critical commentaries on the production of space in the city (urban sociology and psychogeography). The Conclusion evaluates the aims of the study and reevaluates Inventory journal on the basis of the critical traditions surveyed in the prior chapters and in terms of problems arising from the path the journal followed and gaps between its projected programme or method and the achievements it attained