An experiment has demonstrated that benzoquinone (BQ) addition into a precursor solution for the fabrication of perovskite films increases conversion efficiency through improved perovskite morphology and crystal quality while also significantly extending device lifetime by reducing the formation of carrier traps during solar irradiation. Films of the perovskite CH3NH3PbI3 were prepared on a film of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) coated on indium-tin-oxide (ITO) substrates by spin casting from a precursor solution of MAI, PbI2, and BQ. During spin casting, intermolecular interactions between MAI and BQ compete with the reaction between MAI and PbI2 to form the 3D perovskite structure, thus reducing the speed of crystallization. After annealing at 90°C in a nitrogen-filled glove box, CH3NH3PbI3 films containing BQ additive were obtained. The amount of BQ in the film was estimated from the absorption spectrum of a CH3NH3PbI3 film containing BQ additive fabricated on glass and then dissolved in DMSO. Absorption originating from BQ was observed at around 340 nm from both the precursor solution and eluent. The pristine CH3NH3PbI3 perovskite films were hazy and brown with a poly-dispersed small crystal island structure having poor surface morphology because of the relatively fast crystallization. Flat, uniform perovskite surfaces with large grains were obtained from the precursor solution containing 0.5% BQ.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering