Overview
IEC TS 62607-7-2:2023 - "Nanomanufacturing – Key control characteristics – Part 7-2: Nano-enabled photovoltaics – Device evaluation method for indoor light" - is an IEC Technical Specification that defines efficiency testing and device evaluation methods for photovoltaic (PV) cells under indoor illumination. It is targeted primarily at nano‑enabled PV cells (organic thin‑film, dye‑sensitized cells (DSC), and perovskite cells) but is explicitly applicable to other PV technologies (Si, CIGS, GaAs, etc.), excluding multi‑junction cells.
Key Topics
The specification establishes measurement practices, required equipment, and reporting for indoor PV testing. Major technical topics and requirements include:
- Current–voltage (I–V) characterization: device under test (DUT) requirements, illumination adjustment methods, and measurement procedures.
- Indoor reference photovoltaic cells: selection, calibration and use for traceability and spectral‑mismatch correction.
- Standard indoor light: defined standard illuminance levels and spectral irradiance (example spectrum provided at 1 000 lx).
- Traceability and calibration chain: documentation and calibration flow to ensure measurement comparability.
- Temperature correction: requirements for DUT temperature control and correction factors during measurements.
- Spectral‑mismatch and spectral responsivity: methods to determine and correct differences between DUT response and reference spectra; measurement of spectral responsivity S(λ).
- Illumination sources: classification, spectral coincidence, illuminance non‑uniformity, temporal stability and recommended practices.
- Nonlinearity tests: requirements and notes on device linearity under varied illuminance.
- Reporting: standardized result and calibration records to ensure reproducibility and comparability.
Applications and Who Uses It
This Technical Specification is practical for:
- Manufacturers and developers of nano‑enabled PV devices designing cells for indoor energy harvesting (IoT sensors, wearables, low‑power electronics).
- Test laboratories and certification bodies performing indoor PV efficiency measurements and issuing performance data.
- R&D teams and academic researchers evaluating indoor performance of organic, perovskite, DSC and other PV technologies.
- Product integrators optimizing power budgets for indoor energy harvesting systems.
Practical applications include benchmarking indoor power conversion efficiency, validating device performance for low‑illuminance environments, establishing product datasheets, and supporting claims for indoor energy harvesting solutions.
Related Standards
- IEC TS 62607 series (other parts) - broader nanomanufacturing key control characteristics.
- IEC 60904 series - established PV device measurement practices (this document provides correspondence with clauses of IEC 60904 for indoor contexts).
Keywords: IEC TS 62607-7-2:2023, nano-enabled photovoltaics, indoor light, device evaluation method, indoor photovoltaics, efficiency testing, spectral irradiance, illuminance, traceability, spectral-mismatch correction.