Professor Li from the photovoltaic materials laboratory of a top university once encountered difficulties in the research and development of perovskite solar cells: "When our team was optimizing the composition of perovskite materials, we were always unable to precisely grasp the separation efficiency and lifespan of photogenerated carriers." The signal sensitivity of traditional testing equipment is low, and it is unable to distinguish the surface photovoltage changes at the nanovolt level. This has led us to mistakenly take material systems with high carrier recombination rates as the optimization direction, and we have invested a lot of time and funds but achieved little. Moreover, traditional equipment can only conduct single-steady-state tests and is unable to capture the dynamic migration process of carriers. Research on key mechanisms has always been difficult to break through.
The introduction of Saifan Optoelectronics' surface photovoltage testing system has completely reversed this situation. This system is equipped with a high-sensitivity photoelectric detection module and a wide-spectrum monochromatic light source, with a spectral coverage of 300-1700nm, which can precisely match the light absorption characteristics of different photovoltaic materials. The signal detection accuracy reaches the nanovolt level, capable of clearly capturing the weak photovoltage signals on the surfaces of materials such as perovskite, organic photovoltaics, and crystalline silicon, and precisely quantifying the separation efficiency and recombination rate of photogenerated carriers. Meanwhile, the system supports dual-mode testing of steady-state surface photovoltage spectroscopy (SPV) and transient surface photovoltage spectroscopy (TPV). The steady-state mode can quickly assess the light response characteristics and surface defect state density of materials, while the transient mode can accurately measure the carrier lifetime, providing direct data support for the study of carrier migration mechanisms.
"Saifan's surface photovoltage testing system is our 'scientific research navigator'!" " Professor Li excitedly shared, "By leveraging the system's highly sensitive testing capabilities, we successfully distinguished the differences in carrier separation efficiency among perovskite materials of different components, quickly identified the optimal material ratio, and shortened the research and development cycle by 40%." Through the transient test module, we also clearly observed the carrier migration process at the perovskite/charge transport layer interface for the first time, providing a key basis for the optimization of interface modification schemes. At present, based on the test data of this system, we have published three research papers in top journals, and the related technical solutions have also been adopted by our cooperative enterprises, accelerating the industrialization process of high-efficiency perovskite solar cells.
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