Abstract
The interface related to the polycrystalline hybrid perovskite thin film plays an essential role in the resulting device performance. Iodine was employed as an additive to modify the interface between perovskite and spiro-OMeTAD hole transport layer. The oxidation ability of iodine significantly improved the efficiency of charge extraction for perovskite solar cells. It reveals that the Open Circuit Voltage (Voc) and Fill Factor (FF) of perovskite solar cells were improved substantially due to the dopant, which is mainly attributed to the interfacial improvement. It was found that the best efficiency of the devices was achieved when the dopant of iodine was in equivalent mole concentration with that of spiro-OMeTAD. Moreover, the long-term stability of the corresponding device was investigated.
Highlights
Organometal halide perovskite solar cells (PSCs) have attracted much attention because of their advantages such as high-power efficiency [1,2,3], flexibility [4,5,6], and long-term stability [7,8,9].Compared with silicon solar cells [10,11,12], perovskite solar cells have simplified manufacture processing, and can be rapidly fabricated by spin-coating with precursor solutions of lead (II) iodide and methylamine hydroiodide (MAI)
Perovskite crystal surface and interfaces play an essential role in determining device performance, which includes different functional components such as the electron transport layer (ETL), hole transport layer (HTL), counter electrode, and so forth
Considering HTL aging, we propose iodine as a dopant in the spiro-OMeTAD layer in order to increase the efficiency of charge extraction without damaging the polycrystalline perovskite thin films
Summary
Organometal halide perovskite solar cells (PSCs) have attracted much attention because of their advantages such as high-power efficiency [1,2,3], flexibility [4,5,6], and long-term stability [7,8,9]. Considering HTL aging, we propose iodine as a dopant in the spiro-OMeTAD layer in order to increase the efficiency of charge extraction without damaging the polycrystalline perovskite thin films. Recently found that additional iodide ions could decrease the concentration of deep-level defects in formamidinium-lead-halide-based perovskite solar cells. This research indicated that using the dopant of iodine was a feasible method for methylamine-lead-halide-based perovskite solar cells as well
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