Enli Tech Lab introduces NREL’s latest Asymptotic Pmax protocol to certify Perovskite/ OPVs with higher efficiency.
Since 2019, Enli Tech. Optoelectronic Calibration Lab (Enli Tech Lab) has introduced NREL’s latest standard: Asymptotic Pmax protocol to certify the efficiency and maximum power (Pmax) of perovskite and organic solar cells and keep pace with the highest level of evaluation method which is taken as a reliable standard for the new type of photovoltaics.
Perovskite solar cells have shown a rapid advance in reported efficiencies in past years. Certified record efficiencies have gone from 14% to 23.8% in only four years. The rapid advance has accompanied by some unique and extreme characterization artifacts which tend to manifest themselves as large hysteresis effects, depending on scan rates and directions and light bias exposure history. Some measurement artifacts and hysteresis effects make characterization difficult and may have resulted in some exaggerated efficiency reports.
Therefore, NREL proposed the Asymptotic Pmax protocol to standardize measurements and provide accurate characterization of photovoltaics.
Enli Tech Lab is accredited by ISO/IEC 7025 standards and introduces the Asymptotic Pmax protocol evaluation method for perovskite and organic solar cells. We offer QE/SR/Jsc/Pmax/PCE certifications and help our clients including international research labs, universities, etc. to certify the photovoltaics devices. The certified results have been reported by several journals such as Joule, Advanced Materials.
■ Asymptotic Method
Asymptotic scans are measured by holding the cell at a set of voltages near Vmax until the current reaches an asymptotic level for each voltage. The voltage vs. asymptotic current data is then applied to the standard Pmax derivation algorithm.
■ Standard Sweep
Fast scans from forward to reverse and from reverse to forward before and after the asymptotic Pmax measurement indicated that this device was not susceptible to some commonly seen measurement artifacts for OPV. Consequently, we have included standard IV sweeps in this data compilation.
FAQs about Perovskite/ OPVs efficiency certification
Q1: About Perovskite solar cells certification. Is it possible to choose only one evaluation method, the Standard Sweep to certify device performance instead of Asymptotic Method?
A1: The types of perovskite solar cells are diverse, and hysteresis effects can make the results of device performance inaccurate. To ensure the certified result can be recognized by the International Third-party Calibration Labs, we strongly suggest you choosing Asymptotic Pmax Method. If you chose the Standard Sweep Method, Enli Tech Lab still provides the sample testing services but no certificate.
Q2: About organic solar cells certification. Is it possible to choose only one evaluation method, the Standard Sweep to certify device performance instead of Asymptotic Method?
A2: Regardless of OPVs or perovskite solar cells, NREL measures the quantum efficiency and other parameters of devices with Asymptotic Pmax Method. The morphology and structure of OPV is similar to perovskite devices. Moreover, OPV materials improve rapidly, it’s hard to identify photovoltaic devices. To ensure the certified resulted can be recognized by the International Third-party Calibration Labs, Enli Tech Lab adopt Asymptotic Pmax Method to measure the efficiency and Pmax, which is same to NREL’s certification.
Enli Tech Lab provides efficiency certification services for any kind of solar cells, and the certification items are as follows:
◎ Maximum Power & Efficiency , Pmax & PCE
◎ External Quantum Efficiency, EQE
◎ Spectral Response, SR
◎ Short-circuit Current Density, Jsc
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