Decorating wide band gap CH3NH3PbBr3 perovskite with 4AMP for highly efficient and enhanced open circuit voltage perovskite solar cells

• Pristine and aminomethyl piperidinium (4AMP) doped CH 3 NH 3 PbBr 3 thin films are prepared by sol-gel spin coating technique. • Rhombohedral structure is confirmed by XRD and Eg is decreased from 2.341 eV to 2.311 eV due to doping. • High value of J sc and V oc of 4AMP doped MAPbBr 3 resulted in high efficiency 10.21%. Halides based organic-inorganic solar cells have attracted huge attention for efficient energy harvesters owing to their low fabrication cost, large functioning area, long lifetime, and high conversion efficiency. Here we report the fabrication of pristine and aminomethyl piperidinium (4AMP) doped CH 3 NH 3 PbBr 3 based thin film using spin coating technique to explore its potential for energy harvesting. The structural analysis confirmed the development of the rhombohedral structure of pristine and doped CH 3 NH 3 PbBr 3 . SEM and AFM images revealed that grains for the pure sample are highly compact linked with each other with sharp grain boundaries but their size increased when doped with 4AMP. A direct bandgap of 2.341 eV is noticed for pristine which is slightly decreased to 2.311 eV as a result of doping. The calculation of space charge limited current, PL decay profile analysis, charge transfer resistance, and Mott Schottky analysis provide quite convincing evidence regarding the high conversion efficiency of these films. A sufficiently high value of short circuit current density resulted in high efficiency of pristine MAPbBr 3 i.e., 8.46% which increased to 10.21% due to improvement of solar cells parameters such as V oc of 1.46 V when doped with 4AMP. These values of efficiencies make the halide based organic compositions viable for solar cell applications.