Overview
IEC TS 62789:2014 - Photovoltaic Concentrator Cell Documentation is an international technical specification developed by the International Electrotechnical Commission (IEC). This document establishes standardized guidelines for documenting the key parameters of concentrator photovoltaic cells, applicable to both multijunction and single junction cell designs. The aim is to facilitate consistent and transparent communication of the performance and physical characteristics of these high-performance solar cells, supporting easier comparison and informed decision-making within the solar energy industry.
While IEC TS 62789:2014 does not define specific pass/fail criteria, it emphasizes the clear definition and reporting of parameters relevant to concentrator photovoltaic (CPV) cell quality and performance. The specification is also applicable to the documentation of cell assemblies and receivers, enhancing the harmonization of technical data across CPV supply chains.
Key Topics
IEC TS 62789:2014 covers a comprehensive set of parameters and documentation practices for CPV cells, including:
- Product Identity and Description: Clear identification of manufacturer, model number, cell type, and materials used for each junction.
- Physical Parameters: Definition of total chip area and designated illumination area, including sketches and dimensions for clarity.
- Performance Characteristics: Reporting of nominal efficiency, design irradiance, and key values such as open-circuit voltage (Voc), short-circuit current (Isc), maximum power, and fill factor for consistent performance evaluation.
- Electrical Performance Data: Presentation of current-voltage (I-V) curves, efficiency versus irradiance, and voltage at maximum power point as a function of irradiance.
- Spectral and Angular Response: Documentation of quantum efficiency for each cell junction and angular responsivity data to understand cell performance under varying conditions.
- Thermal Behavior: Inclusion of temperature coefficients (e.g., for Voc and Isc) based on standardized measurement conditions.
- Cell Processing and Handling: Recommendations for processing temperatures, storage conditions, bonding methods, and chemical compatibility to ensure cell integrity.
- Testing and Quality: Guidance on reporting test procedures, sample sizes, and conditions relevant for cell characterization.
Applications
IEC TS 62789:2014 is critically relevant for organizations involved in the design, testing, production, specification, or procurement of concentrator photovoltaic cells and systems. Key applications include:
- Cell Manufacturers: Ensuring datasheets are comprehensive and enable consistent interpretation by customers and downstream integrators.
- Module and System Integrators: Validating cell specifications and selecting optimal cells or assemblies for high-concentration PV systems.
- Research and Development: Streamlining comparative evaluation of innovative cell designs and supporting reproducible experimental practices.
- Testing Laboratories: Providing a reference template for performance and quality testing to ensure results can be benchmarked across the industry.
- Procurement and Quality Assurance: Facilitating transparent and reliable supplier evaluations through standardized reporting and documentation.
Consistent use of IEC TS 62789:2014 enhances the reliability, comparability, and traceability of CPV component performance data, which is essential to the global adoption of solar energy technologies.
Related Standards
For a holistic approach to photovoltaic standardization, IEC TS 62789:2014 references and complements other key standards, including:
- IEC 60904-3: Measurement principles for terrestrial photovoltaic devices, establishing reference spectral irradiance data.
- IEC 62787: Reliability qualification for concentrator photovoltaic solar cells and cell-on-carrier assemblies.
- IEC 62108: Design qualification and type approval for concentrator photovoltaic modules and assemblies.
- IEC 61836: Terms, definitions, and symbols for solar photovoltaic energy systems.
By following IEC TS 62789:2014 alongside these related standards, industry stakeholders can achieve robust documentation and quality assurance for concentrator photovoltaic products, supporting the advancement of solar power technologies worldwide.