Once again, organometallic tri-halide perovskites Efficient light harvester for solid state perovskite solar cells

Methylammonium cations (CH3NH3+PBI3) perovskite quantum-dots have once more been highlighted through work by Im and colleagues in 2011 via an ex situ method with 6.5% power conversion efficiency (PCE). However, these cells were not stable due to the fast degradation and decomposition of CH3NH3PbI3 into a liquid redox electrolyte. This problem was solved by Gratzel and co-researchers in 2013 using solid state perovskite solar cells (PSCs) In a typical PSC, an absorber layer (perovskite) is sandwiched between an electron transport layer (ETL) and a hole transport layer (HTL). The compact titanium oxide blocking layer (Bl-TiO2) with or without mesoporous scaffold (TiO2 or Al2O3) acts as an ETL, and the hole transporting material (HTM), and the counter electrode are the key components of the HTL On the other hand, Snaith and colleagues synthesized mixed halide perovskite CH3NH3PbI3-xClx using a dual-source vapor deposition technique for planar heterojunction PSCs Sang Il Seok and colleagues remarkably improved the PCE up to 16.2% via toluene drip treatment Researchers are currently investigating the PSCs fabrication and testing based on low temperature pro-cessed one-dimensional (1D) and three-dimensional (3D) TiO2 nanostructures.