Abstract
In recent years, lead halide perovskites have attracted considerable attention from the scientific community due to their exceptional properties and fast-growing enhancement for solar energy harvesting efficiency. One of the fundamental aspects of the architecture of perovskite-based solar cells (PSCs) is the electron transport layer (ETL), which also acts as a barrier for holes. In this work, the influence of compact TiO2 ETL on the performance of planar heterojunction solar cells based on CH3NH3PbI3 perovskite was investigated. ETLs were deposited on fluorine-doped tin oxide (FTO) substrates from a titanium diisopropoxide bis(acetylacetonate) precursor solution using the spin-coating method with changing precursor concentration and centrifugation speed. It was found that the thickness and continuity of ETLs, investigated between 0 and 124 nm, strongly affect the photovoltaic performance of PSCs, in particular short-circuit current density (JSC). Optical and topographic properties of the compact TiO2 layers were investigated as well.
Highlights
One of the most reasonable responses for growing global electricity demands, respecting the need to protect the natural environment, is harnessing solar energy by means of photovoltaic devices
Slightly higher efficiencies are obtained with mesoporous titania scaffolds [5], planar structures without them are more prospective from an industrial point of view
The perovskite-based solar cells (PSCs) structure is composed of a perovskite absorber layer placed between a selective transport layer for holes (HTL) and electrons (ETL)
Summary
One of the most reasonable responses for growing global electricity demands, respecting the need to protect the natural environment, is harnessing solar energy by means of photovoltaic devices. The PSC structure is composed of a perovskite absorber layer placed between a selective transport layer for holes (HTL) and electrons (ETL). Saliba et al [4] used 20–30 nm thick SnO2 (instead of TiO2) in the planar regular structure (n–i–p) and a 20–30 nm compact TiO2 layer for the mesostructure for high-efficiency solar cells with a PCE ≥20%. The regular planar n–i–p architecture of PCSs was studied, i.e., glass/FTO/c-TiO2/MAPbI3/Spiro-OMeTAD/Au. In this report, we deposited ETLs using a titanium diisopropoxide bis(acetylacetonate) (Ti(acac)2OiPr2) precursor solution in 1-BuOH. We deposited ETLs using a titanium diisopropoxide bis(acetylacetonate) (Ti(acac)2OiPr2) precursor solution in 1-BuOH This set was chosen because its good performance matches the preparation simplicity and good storage stability. Complex studies enabled a better understanding of the observed effects
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