van de Ven Larissa J M, Tekelenburg Eelco K, Pitaro Matteo, Pinna Jacopo, Loi Maria A
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
ACS Energy Lett. 2024 Feb 15;9(3):992-999. doi: 10.1021/acsenergylett.4c00055. eCollection 2024 Mar 8.
Slow hot-carrier cooling may potentially allow overcoming the maximum achievable power conversion efficiency of single-junction solar cells. For formamidinium tin triiodide, an exceptional slow cooling time of a few nanoseconds was reported. However, a systematic study of the cation influence, as is present for lead compounds, is lacking. Here, we report the first comparative study on formamidinium, methylammonium, and cesium tin triiodide thin films. By investigating their photoluminescence, we observe a considerable shift of the emission peak to high energy with the increase of the excited-state population, which is more prominent in the case of the two hybrid organic-inorganic perovskites (∼45 meV vs ∼15 meV at 9 × 10 cm carrier density). The hot-carrier photoluminescence of the three tin compositions decays with a 0.6-2.8 ns time constant with slower cooling observed for the two hybrids, further indicating their importance.
缓慢的热载流子冷却可能潜在地有助于突破单结太阳能电池可实现的最大功率转换效率。对于甲脒三碘化锡，有报道称其具有几纳秒的异常缓慢冷却时间。然而，对于铅化合物中存在的阳离子影响，缺乏系统性研究。在此，我们报道了关于甲脒、甲基铵和铯三碘化锡薄膜的首次对比研究。通过研究它们的光致发光，我们观察到随着激发态载流子数量的增加，发射峰显著向高能方向移动，这在两种有机-无机杂化钙钛矿中更为明显（在载流子密度为9×10时，约为45 meV，而在另一种情况下约为15 meV）。三种锡化合物的热载流子光致发光以0.6 - 2.8纳秒的时间常数衰减，两种杂化物的冷却速度较慢，这进一步表明了它们的重要性。
