Egyptian researchers have developed a novel gap transport layer (HTL) for inverted perovskite photo voltaic cells utilizing silver thiocyanate as a substitute of the generally used PEDOT: PSS and copper thiocyanate. The brand new HTL materials exhibits distinctive effectivity and sturdiness within the constructed cell.
Researchers from the Central Metallurgical Analysis and Growth Institute (CMRDI) in Egypt have produced an inverted perovskite photo voltaic cell with a brand new kind of gap transport layer (HTM) based mostly on silver thiocyanate (AgSCN). Scientists intention to interchange generally used gap transport supplies equivalent to PEDOT:PSS and copper thiocyanate (CuSCN) with AgSCN.
“Some great benefits of CuSCN lie in the truth that it could actually function a gap transport layer and a supply of Cu doping, whereas AgSCN, with its higher resistivity, can function a supply of Ag doping with slower diffusion fee,” the scientists. defined, noting that AsSCN can be higher at transferring expenses between the HTL and perovskite layer in comparison with PEDOT:PSS.
The group constructed the cell with an indium tin oxide (ITO) substrate, a electron transport layer (ETL) based mostly on AgSCN, an absorber based mostly on a sort of lead-halide perovskite often called methylammonium lead iodide (MAPbI3), a phenyl-C61-butyric acid methyl ester (PCBM) layer, a bathocuproine (BCP) buffer layer, and a silver (Ag) metallic contact.
The teachers deposited the skinny movie of AgSCN in a dry glove field with a relative humidity between 25% and 30% not less than half-hour earlier than beginning the deposition of the perovskite layer. Then they deposited the perovskite layer on the HTL lively layer by spin coating at 4,000 rpm for 30 seconds. The efficiency of the photo voltaic cell is in contrast with a reference system made utilizing HTM based mostly on PEDOT:PSS.
The AgSCN-based system achieved an influence conversion effectivity of 16.66%, an open-circuit voltage of 1.14 mV, a short-circuit present of 19.0 mA/cm2, and a fill issue of 77.1%. The PEDOT:PSS cell reached an effectivity of 15.11%, an open-circuit voltage of 1.04 V, a short-circuit present of 18.17 mA/cm2, and a fill issue of 80.37%.
“The efficiently achieved AgSCN skinny movie produced a greater perovskite movie with free pinholes and enormous grains, whereas the PEDOT:PSS skinny movie produced an identical high quality perovskite movie with pinholes found,” the crew defined, noting that the AgSCN cell was additionally capable of retain 80.9% of its preliminary effectivity after 500 hours in an environment with 48% relative humidity.
“This low-temperature, low-cost manufacturing technique of AgSCN is discovered to be simple and scalable, which is sweet for the commercialization of perovskite-based versatile gadgets and photovoltaic applied sciences,” the researchers concluded. “Typically, AgSCN is a non-toxic, low-cost different that’s easy to make use of at low temperatures. It’s a robust contender for the manufacturing of tandem gadgets and high-efficiency pin junction photo voltaic cells that product of perovskites.
They describe the cell tech in “AgSCN as a brand new cavity-carrying materials for inverted perovskite photo voltaic cells,” lately revealed in Scientific reviews.
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