Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 47, Pages 52500-52508Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c12030
Keywords
perovskite solar cells; Lewis base; nicotinamide; additive; defect passivation
Funding
- Young Scholars Development Fund of SWPU [201699010017]
- Scientific Research Starting Project of SWPU [2017QHZ021]
- Sichuan Science and Technology Program [2018JY0015]
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Passivation of electronic defects on the surface and at grain boundaries (GBs) of perovskite films has become one of the most effective tactics to suppress charge recombination in perovskite solar cells. It is demonstrated that trap states can be effectively passivated by Lewis acid or base functional groups. In this work, nicotinamide (NTM, commonly known as vitamin B3 or vitamin PP) serving as a Lewis base additive is introduced into the PbI2 and/or FAI: MABr: MACl precursor solution to obtain NTM modified perovskite films. It has been found that the NTM in the perovskite film can well passivate surface and GBs defects, control the film morphology and enhance the crystallinity via its interaction with a lone pair of electrons in nitrogen. In the presence of the NTM additive, we obtained enlarged perovskite crystal grain about 3.6 mu m and a champion planar perovskite solar cell with efficiency of 21.72% and negligible hysteresis. Our findings provide an effective route for crystal growth and defect passivation to bring further increases on both efficiency and stability of perovskite solar cells.
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