Elawad Mohammed, Elbashir Abdalla A, Sajid Muhammad, John Kingsley Igenepo, Nimir Hassan, Yang Li, Ziyada Abobakr K, Osman Abdelbagi, Rajab Fahd
Department of Chemistry, Faculty of Science, Omdurman Islamic University, P.O. Box 382, Omdurman, Sudan.
Department of Chemistry, College of Science, King Faisal University, Al-Hofuf, Al-Ahsa 31982, Saudi Arabia.
J Chem Phys. 2024 Jan 28;160(4). doi: 10.1063/5.0176351.
Lithium bis(fluorosulfonyl)imide (Li-TFSI) is an efficient p-dopant that has been used to enhance the conductivity of perovskite solar cells (PSCs). However, the performance of the corresponding devices is still not satisfactory due to the impact of Li-TFSI on the fill factor and the short-circuit current density of these PSCs. Herein, a new Mn complex [(Mn(Me-tpen)(ClO4)2-)]2+ was introduced as a p-type dopant into spiro-OMeTAD and was successfully applied as a hole transport material (HTM) for PSCs. Analytical studies used for device characterization included scanning electron microscopy, UV-Vis spectroscopy, current-voltage (IV) characteristics, incident photon to current efficiency, power conversion efficiency (PCE), and electrochemical impedance spectroscopy. The UV-Vis spectra displayed oxidation in the HTM by the addition of a dopant. Moreover, the movement of electrons from the higher orbital of the spiro-OMeTAD to the dopant stimulates the generation of the hole carriers in the HTM, enhancing its conductivity with outstanding long-term stability under mild conditions in a humid (RH ∼ 30%) environment. The incorporation of the Mn complex into the composite improved the material's properties and the stability of the fabricated devices. The Mn complex as a p-type dopant for spiro-OMeTAD exhibits a perceptible PCE of 16.39% with an enhanced conductivity of 98.13%. This finding may pave a rational way for developing efficient and stable PSCs in real environments.
双（氟磺酰）亚胺锂（Li-TFSI）是一种高效的p型掺杂剂，已被用于提高钙钛矿太阳能电池（PSC）的导电性。然而，由于Li-TFSI对这些PSC的填充因子和短路电流密度的影响，相应器件的性能仍不尽人意。在此，一种新的锰配合物[(Mn(Me-tpen)(ClO4)2-)]2+被作为p型掺杂剂引入到螺环-OMeTAD中，并成功用作PSC的空穴传输材料（HTM）。用于器件表征的分析研究包括扫描电子显微镜、紫外-可见光谱、电流-电压（IV）特性、入射光子到电流效率、功率转换效率（PCE）和电化学阻抗谱。紫外-可见光谱显示，通过添加掺杂剂，HTM发生了氧化。此外，电子从螺环-OMeTAD的较高轨道向掺杂剂的移动刺激了HTM中空穴载流子的产生，在潮湿（相对湿度约30%）环境的温和条件下，提高了其导电性并具有出色的长期稳定性。将锰配合物掺入复合材料中改善了材料性能和所制备器件的稳定性。作为螺环-OMeTAD的p型掺杂剂，该锰配合物表现出可观的16.39%的PCE，导电性提高了98.13%。这一发现可能为在实际环境中开发高效稳定的PSC铺平一条合理的道路。
