Martínez-Pastor Juan P, Sánchez-Díaz Jesús, Villalvilla José M, Soriano-Díaz Sandra, Quintana José A, Mora-Seró Iván, Díaz-García María A, Suárez Isaac
UMDO, Instituto de Ciencia de los Materiales, Universidad de Valencia, Valencia 46980, Spain.
Institute of Advanced Materials (INAM), Universitat Jaume I, Castelló de la Plana, Castelló 12006, Spain.
ACS Photonics. 2025 May 21;12(6):3154-3162. doi: 10.1021/acsphotonics.5c00471. eCollection 2025 Jun 18.
FASnI (FA: formamidinium) polycrystalline perovskite thin films have demonstrated to be an excellent gain media and less toxic alternative to the Pb-containing perovskite light emitters. However, the instability of Sn perovskites prevents the postprocessing of the film after deposition, making its integration in two-dimensional optical architectures challenging. In this article, FASnI polycrystalline thin films are successfully integrated with polymeric diffractive gratings under cost-effective and industrial compatible technology. The gratings are fabricated under holographic techniques, allowing patterning on large areas (≈1 cm) and the posterior deposition of the perovskite films or cladding layers. The grating period demonstrated to be an adequate tuning parameter to control the amplified spontaneous emission (ASE) properties. Notably, the overlap of the mode with the emission band represents a suitable mechanism to selectively enhance the generation of the ASE (tuned device) above a moderate threshold of 100 μJ/cm and extract the random lasing lines created on the grains of the film (detuned device). These results represent a significant advance on Sn-perovskite-based optical sources, offering cost-effective technology for next-generation photonic applications.
FASnI（甲脒）多晶钙钛矿薄膜已被证明是一种优异的增益介质，并且是含铅钙钛矿发光体毒性较小的替代品。然而，锡钙钛矿的不稳定性阻碍了薄膜沉积后的后处理，使其在二维光学结构中的集成具有挑战性。在本文中，FASnI多晶薄膜在具有成本效益且与工业兼容的技术下成功地与聚合物衍射光栅集成。这些光栅是通过全息技术制造的，允许在大面积（约1平方厘米）上进行图案化，并随后沉积钙钛矿薄膜或包层。光栅周期被证明是控制放大自发辐射（ASE）特性的一个合适的调谐参数。值得注意的是，模式与发射带的重叠代表了一种合适的机制，可在100 μJ/cm的适度阈值以上选择性地增强ASE（调谐器件）的产生，并提取在薄膜晶粒上产生的随机激光线（失谐器件）。这些结果代表了基于锡钙钛矿的光源的重大进展，为下一代光子应用提供了具有成本效益的技术。
