Péan Emmanuel V, Zhao Jiashang, Doolin Alexander J, García-Rodríguez Rodrigo, Savenije Tom J, Davies Matthew L
SPECIFIC IKC, Materials Research Centre, College of Engineering, Swansea University Bay Campus, Fabian Way, Swansea, SA1 8EN, UK.
Department of Chemical Engineering, Delft University of Technology, van der Maasweg 9, Delft, 2629 HZ, The Netherlands.
Small Methods. 2025 Apr;9(4):e2400818. doi: 10.1002/smtd.202400818. Epub 2025 Mar 18.
Thanks to their direct band-gap, high absorption coefficient, low manufacturing cost, and relative abundance of component materials, perovskite materials are strong candidates for the next generation of photovoltaic devices. However, their complex photochemistry and photophysics are hindering their development. This is due, in part, to the complex charge carrier recombination pathways in these materials, as well as their instability during measurements. Here, a new characterization methodology is detailed that allows the measurement, with high certainty, of the intrinsic parameters of a single perovskite sample, such as the trap state concentration and carrier mobilities. This methodology is based on a combination of time-resolved microwave photoconductivity (TRMC) and time-resolved photoluminescence (TRPL) spectroscopy. Compared to TRPL only, this methodology is faster, does not lead to significant changes in the perovskite properties over time, and increases the certainty of the parameters retrieved. Using this methodology, green solvent systems are studied to replace the traditional harmful solvents usually used when spin-coating perovskites. Although devices made using the greener solvents presented lower efficiencies, TRMC and TRPL measurements highlighted that the perovskites made with these solvents can achieve the same performance compared to the traditional solvent system.
由于具有直接带隙、高吸收系数、低制造成本以及组成材料相对丰富等特点，钙钛矿材料是下一代光伏器件的有力候选材料。然而，其复杂的光化学和光物理性质阻碍了它们的发展。这在一定程度上归因于这些材料中复杂的电荷载流子复合途径以及它们在测量过程中的不稳定性。在此，详细介绍了一种新的表征方法，该方法能够高度准确地测量单个钙钛矿样品的固有参数，如陷阱态浓度和载流子迁移率。这种方法基于时间分辨微波光电导（TRMC）和时间分辨光致发光（TRPL）光谱的结合。与仅使用TRPL相比，这种方法速度更快，不会导致钙钛矿性质随时间发生显著变化，并且提高了所获取参数的确定性。使用这种方法，对绿色溶剂体系进行了研究，以取代在旋涂钙钛矿时通常使用的传统有害溶剂。尽管使用更环保溶剂制造的器件效率较低，但TRMC和TRPL测量结果表明，与传统溶剂体系相比，用这些溶剂制造的钙钛矿能够实现相同的性能。
