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2. Technical Approach and Planned FY 2006 Activities 1) Develop requirements list for each solar cell type, wherein the transparent conductive (TC) specifications are listed and the advantages and disadvantages of applying the technology are assessed and compared to existing TCCs. 2) Improve optoelectronic performance to achieve greater than 90% transmission at 100 ohms/square through improved purification, dispersion, and morphology and helicity control. 3) Determine the best application method(s) in terms of compatibility with the solar industry. 4) Define photovoltaic design and determine commercial obstacles for implementation in commercial markets. 2.1 Task 1: Determine Requirements Collaborate with team members to create requirements list for each solar cell type, wherein the TC specification are listed and an assessment of technology insertion advantages and disadvantages compared to existing TCCs are summarized. Also an evaluation of the potential uses of InvisiconTM coatings in organic PV fabrication in both the TC layer and other potentially beneficial layers will be conducted. One goal is to have a comprehensive market assessment of where the InvisiconTM coating can be most useful across all PV technologies. Both technical and financial performance metrics will be defined based on this study and incorporated into the implementation plan for Eikos’ transparent conductive coating material in photovoltaic cells. In this task, Eikos will be mining known information and applying the team’s expertise in developing a map where we should focus our efforts in developing the CNT coatings to meet PV cell requirements. Some of the best candidates will be fabricated and tested in the following tasks. Expected Outcome of Task 1: Report detailing applicability for CNT TCC in all known types of PV cells and suggestions for future development and technology insertion. are better understood, they will be immediately applied and exploited to increase optoelectronic performance. This will be demonstrated through the fabrication of TCC for testing and possible insertion into PV cells. A brief description of each factor is provided below. Purification and Yield Improvements. It is desirable to remove all impurities from the CNT layer to allow for the network of ropes to form without hindrance. In this task, Eikos will further increase the purity of the coatings by modifying its purification procedure. This will be done while attempting to increase yield from the process, thereby using as much of the source/raw CNT material in the final coating as possible. This will also act to reduce cost of the coating. Eikos has shown significant improvement in both of these areas over the past year and will continue this effort under this task. Morphology Evaluation and Control. A detailed evaluation of the relationship between the morphology of the CNT in the coatings and their performance will be undertaken. This will involve use of new imaging techniques and those more commonly applied for determining structure property relationships. It is known that the structure of ropes of CNT and how the ropes form greatly influence the optoelectronic performance of TCC. By understanding and exploiting that understanding, we hope to modify the formulation and deposition technology to enhance optoelectronic performance. Study Dispersion Effectiveness. Eikos will develop a family of formulations with tailored solids content and rheology to yield the desired sheet resistance range and optical transmittance. In many cases, the solids content needs to be 10 to 100x higher than our current formulations for use in traditional coating processes. To avoid particle agglomeration in this higher solids formulation, enhancements to CNT dispersion stability is required. This will be accomplished by modifying surface chemistry and dispersion energy. Additional dispersing additives may also be used. It is important to note that if dispersion stability is inadequate, then the consequence to optoelectronic performance is very significant (i.e., for a given sheet resistance value, the visible light transmittance will be lower than expected). In reformulating the coating, various dispersion techniques will be investigated and new analytical techniques for evaluating the dispersion quality will be evaluated and used. 2.2 Task 2: Improvements Eikos will research four approaches to enhance optoelectronic performance in the TCC. Each of these is interdependent, yet distinct enough to be described in separate tasks. As the mechanisms EERE Crosscutting Activities 184 Optoelectronic PerformancePDF Image | DOE Solar Energy Technologies Program
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