The separation, migration, recombination and interface transport characteristics of photogenerated charges are the core keys determining the performance of photocatalysis, photovoltaic cells, and semiconductor photovoltaic materials. Traditional optical characterization methods mostly focus on macroscopic spectral performance and are difficult to capture the microscopic charge dynamics behavior at the material surface and interface, unable to precisely analyze the deep mechanisms such as band bending, carrier diffusion, and interface charge transfer; some electrical testing methods require contact electrodes, are prone to damaging the samples, and cause interference to the surface state, unable to truly reflect the intrinsic photovoltaic properties of the materials, severely restricting the efficiency of mechanism research, modification iteration, and device performance optimization of photovoltaic materials.
Deeply engaged in the field of precise photovoltaic characterization technology, Saifan Optoelectronics relies on mature core technologies such as single-color light regulation, ultra-weak signal acquisition, and transient time sequence analysis, and has launched the Surface Photovoltage (SPV) testing system. Based on the principle of non-contact and non-destructive photovoltaic effect detection, it integrates steady-state spectral response and transient dynamics testing, without the need for electrode contact, without sample pre-treatment, and accurately captures the changes in surface photovoltage signals, deeply analyzing charge separation efficiency, carrier lifetime, and interface transport laws, providing a standardized, high-precision, and traceable complete set of testing solutions for photovoltaic material research innovation, mechanism analysis, and process optimization.
Non-contact non-destructive detection, restoring the intrinsic photovoltaic properties of the materials
Different from the contact detection limitations of traditional electrochemical and electrical tests, this system adopts a full-process non-contact non-destructive characterization mode, relying on the surface photovoltaic effect for signal acquisition, without the need for evaporated electrodes, without electrolyte immersion, and without damaging the surface morphology and microstructure of the samples, maximizing the retention of the material's intrinsic interface state. It can directly test various forms of samples such as powders, films, blocks, porous, and flexible samples, suitable for repeated testing of fragile nanomaterials, film coatings, and freshly prepared samples, completely solving the industry pain points of contact interference, sample damage, and data distortion in traditional testing.
By accurately capturing the changes in potential difference on the material surface under light excitation, it directly reflects the degree of band bending, surface charge accumulation state, and photogenerated carrier separation ability, accurately distinguishes the material's conductive type, defect state distribution, and interface potential barrier characteristics, providing the most real microscopic data support for analyzing the differences in material photovoltaic performance.
Steady-state SPV spectroscopy + transient TPV dynamic response dual testing mode, comprehensive analysis of charge dynamics
The system innovatively adopts a steady-state SPV spectroscopy + transient TPV dynamic response dual testing mode, covering both static mechanism and dynamic process, achieving comprehensive and deep characterization of photovoltaic performance. The steady-state mode uses wide-spectrum single-color scanning to obtain the surface photovoltage spectral response curve, accurately determining the material's light response wavelength band, band structure, optimal excitation range, and analyzing the charge separation efficiency under different wavelengths of light, suitable for basic research on the spectral matching and light response characteristics of semiconductor materials.
The transient time sequence testing mode can accurately capture the dynamic decay process of photovoltage from nanoseconds to seconds, efficiently analyzing the migration, recombination, and relaxation dynamics of photogenerated carriers, accurately calculating the carrier lifetime, diffusion length, and interface transport rate, effectively distinguishing fast-migrating charges from slow-combining charges, deeply revealing the core mechanisms such as material defect recombination and interface charge loss, and perfectly adapting to the advanced photovoltaic dynamics refinement research scenarios.
Wide-spectrum precise light control + ultra-sensitive signal acquisition, precise capture of weak signals
The system is equipped with a high-precision wide-spectrum adjustable single-color light source system, covering the mainstream excitation wavelengths of ultraviolet-visible-near-infrared, with continuous adjustable light intensity, uniform and stable light spots, and precisely controllable wavelengths, which can precisely match the light excitation requirements of different bandgap width semiconductor materials, trigger intrinsic excitation and defect-state excitation, ensuring the stability and effectiveness of the test signals from the source. Combined with multi-level optical path noise reduction and anti-interference design, it completely isolates environmental light and electromagnetic interference.
Equipped with the self-developed ultra-weak signal amplification and acquisition module by Sefan, the system exhibits excellent signal-to-noise ratio and can precisely capture the weak photoelectric voltage signals that traditional equipment cannot identify. It effectively adapts to high-precision testing of materials with low quantum efficiency, weak light response, and low carrier mobility. It clearly presents the subtle differences in the photoelectric performance of materials, with excellent test data repeatability and strong traceability, fully meeting the strict precision requirements of universities for cutting-edge research and enterprises for process iteration.
Intelligent and fully automatic testing and analysis, with simple operation and efficient data output
The system is equipped with an exclusive intelligent measurement and control analysis software, eliminating the cumbersome optical path debugging, parameter calibration, and manual fitting processes of traditional equipment. It enables one-click automatic spectral scanning, dynamic signal acquisition, baseline correction, curve fitting, parameter analysis, and report generation. Users can customize core parameters such as scanning wavelength range, integration time, sampling frequency, and test interval, suitable for various testing conditions.
The software automatically presents steady-state spectral curves and transient decay curves, intelligently calculates core parameters such as carrier lifetime, charge separation efficiency, and decay constant, and quickly outputs standardized test reports. The operation threshold is low, the automation level is high, effectively avoiding human operational errors, significantly improving experimental testing efficiency, and suitable for regular scientific research testing and batch sample comparison analysis scenarios.
Wide application scenarios, covering the full range of research on photoelectric materials
This system is compatible with the fine characterization of most photoelectric functional materials and is widely used in research fields such as photocatalytic materials, perovskite photovoltaic materials, two-dimensional nanomaterials, semiconductor oxides, quantum dots, organic photoelectric materials, and photoelectric sensing materials. It can precisely support various scientific research directions such as photocatalytic water splitting, pollutant degradation, solar cell photoelectric conversion, photoelectric sensing response, and material modification mechanism, covering the entire process of basic mechanism research, new material development, process optimization, and performance benchmarking.
The equipment does not require complex sample pretreatment, and the testing process is simple and efficient. It can not only meet the in-depth research requirements of the laboratory's frontiers but also be adapted to frequent application scenarios such as material formula screening, process optimization, and product performance quality control in enterprises.
Modular expansion architecture, adapting to advanced customized research needs
The system adopts an open modular design, supporting flexible function upgrades and personalized customization, and can fully match high-level research needs. It can be expanded with temperature test modules to explore the influence laws of temperature on charge migration and recombination characteristics; it can be combined with atmosphere control components to achieve in-situ testing under different atmospheres such as vacuum, inert, air, and water vapor, simulating the actual application conditions of materials; it can be linked with photoelectric current synchronous testing modules to achieve coordinated characterization of photoelectric voltage and photoelectric current, comprehensively improving the evaluation system of photoelectric performance.
Domestic high-quality products replacing imported ones, high cost-effectiveness enabling scientific research upgrades
Compared with imported high-end surface photoelectric voltage testing equipment, Sefan Optics, relying on its complete independent R&D and local production advantages, has fully autonomous control of the core optical path, signal acquisition module, and measurement and control algorithms. The overall sensitivity, resolution, and stability fully match the international leading level. At the same time, it completely solves the pain points of high-priced equipment, long delivery cycle, delayed after-sales response, difficult customization and modification, and high maintenance costs of imported equipment, and has the core advantages of non-destructive testing, high sensitivity, high stability, easy operation, short delivery time, and full-process technical support.
The manufacturer provides on-site installation and commissioning, professional technical training, lifetime maintenance, and one-stop customized services, significantly reducing the equipment procurement and maintenance costs of scientific research institutions and high-tech enterprises, helping to replace photoelectric material characterization equipment with domestic products, and enabling scientific research innovation and industrial quality improvement in the photovoltaic field. The Saifan Optoelectronics Surface Photoelectric Voltage Testing System, with its non-contact non-destructive characterization, integrated testing of stable and transient states, ultra-high sensitivity for capturing weak signals, intelligent and simple operation, and modular expansion capabilities, deeply decrypts the charge dynamic mechanism at the semiconductor material interface. It lays a precise, stable, and traceable testing foundation for the research and development of new optoelectronic materials, mechanism innovation, and process optimization, and continuously empowers the high-quality development of the fields of photocatalysis, photovoltaics, and optoelectronic sensing.
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