The main target of the HELSOLAR project is foreseen as 1Wp cost decreasing for 50-60 %. The cost of installed 1Wp is defined by the efficiency of SC and cost of SC. The cost of SC is shared by the cost of material and manufacturing cost. What the way can be chosen to overcome this problem, you can see in graph (Fig. 1). There: g - decreasing of material cost, h - increasing of efficiency, d - decreasing of E/Wp if cost of the new SC remains the same as 15 % commerce SC.

The main target can be achieved by the following combination: reduction of wafer cost by 30 %; increasing of SC efficiency to 20 %; decreasing of SC with efficiency 20 % manufacturing cost to 15 % efficiency SC cost.

Strategy

Our strategy is to pass from the flat SC conception to spatial solar cell (SSC), allowing both an efficiency increasing and self-formation introducing into manufacturing technology.

For this investigation we chose two generalised spatial structures: ORTO&FA. The final structure and its optimization can be defined out only by iterative processes, using appropriate simulation models for self-formation processes and performance characteristics as well. There are many known simulation models for the defining of SC performance characteristics. All of them are based on the one-dimension approach. We need the two-dimensional approximation.

We have the self-formation theory for flat planar systems only, based on differential approach [1] of flat contours and flat figures and evolution 8-dimensional topological space [2], which generalize many known inventions in microelectronics and predicts the dramatically new possibilities on the way to development and reproduction of the artificial systems.

We made an effort to define such a theory to SC self-formation processes, suggesting decreasing of number of the patterning processes until a single one remains. However it became clear this theory can be used only as a good basis for its development to spatial planar structures, but is impotent for its approximation and elaboration of the new SSC self-formation processes.

Objectives

1. Development of self-formation theory for spatial planar objects, including:
• new topological approximation of the topological space,
• new object definition,
• new medium definition,
• enhance of the matrix of interactions,
• evolution not only as on the surface, but on cross-section planes as well.
2. Development of software for simulation of spatial SC performance characteristics:
• light absorbtion by spatial surfaces,
• SC electrical performance.
3. Creation of the new leading to the patents SC structures, based on:
• knowledge of the main dependences between physical properties and performance characteristics of SC,
• knowledge of the general laws of self-formation and possibilities of its application for creation of the SC manufacturing methods.
4. Iterative optimisation of chosen new SC structures, using software according p.2.
5. Development of software for simulation of spatial SC self-formation processing where initial data:
• initial cross-section configuration,
• set of parameters juxtaposed with materials,
• matrix of interactions (processes).
6. Creation of the new self-formation methods of manufacturing SC comprising new structure and new processing according p.5 and its optimisation by iterative process:
• defining of the initial object surface configuration
• defining of interaction matrix
• juxtaposing of parameters to materials
• selection of evolution processes and sequence of homogeneous media
• selection of the optimal version
7. Selection of the optimal SC structures in respect to results according p 4, 6.
8. Defining of the new technological processes indispensable for SC manufacturing
9. Elaboration and testing of the new experimental processes
10. Elaboration of the SC manufacturing routing card
11. Consulting under SC manufacturing technology elaboration process