水热法制备WO3纳米阵列及其在钙钛矿太阳电池中的应用（英文）

Preparation of WO3 Nanoarrays by Hydrothermal Method and Its Application in Perovskite Solar Cells

以不同浓度的钨源溶液通过水热法制备了W03纳米树叶阵列和W03纳米片阵列，并研究了其形貌、晶相和吸收光谱。基于WO3纳米树叶阵列作为骨架层的钙钛矿太阳电池实现了4．96％的光电转化效率（PCE），且开路电压（Voc）为0．48V，短路电流密度（Jsc）为19．66mA．cm-2，填充因子（fF）为0．52。基于WO3纳米片阵列的太阳电池的PCE，Voc，Jsc和fF分别为0．27％，0．14V，5．96mA·cm-2，0．32。WO3纳米阵列与空穴传输材料的直接接触增加了电子和空穴的复合，不利于电池的开路电压和填充因子。

WO3 nanoleaf arrays and WO3 nanosheet arrays were prepared by hydrothermal method at different tungsten source concentrations. The morphology, crystal phase and absorption spectra of WO3 nanoarrays were investigated. The perovskite solar cells based on WO3 nanoleaf arrays as a scaffold layer have a photoelectric conversion efficiency （PCE） of 4.96%, with an open-circuit voltage （Voc） of 0.48 V, a short-circuit photocurrent density （Jsc） of 19.66 mA·cm-2 and a fill factor （fF） of 0.52, and the solar cells based on WO3 nanosheet arrays have the PCE, Voc, Jso andfF of 0.27%, 0.14 V, 5.96 mA·cm-2 and 0.32, respectively. The direct contact between WO3 nanoarrays and the hole-transporting materials increases the recombination of hole and electron, thus resulting in relatively low values of Voc and fF.