Abstract A simple, cost effective production approach having high stability is pertinent to any organic-inorganic perovskite solar cells. The main focus of the present work has been to formulate and estimate the stability of CH3NH3PbBr3 micro-cubes and nanoparticles based perovskite solar cells. Firstly, novel synthesis route has been introduced for the preparation of CH3NH3Br (MABr) electrolyte salt which is less time consuming, as well as cost effective than pristine methods. We also reported a facile single solution process to grow large scale CH3NH3PbBr3 (MAPbBr3) hybrid perovskite micro-cubes and nano-particles. The effect of different size (micro-cube & nano-particles) of perovskite material on structural, optical, thermal stability and degradation kinetics has been examined. X-ray diffraction spectra of MAPbBr3 perovskite reflect high crystallinity and cubic structure of the material at the room temperature. The surface morphology of micro-cubes and nano-particle MAPbBr3 has been obtained from scanning electron microscope (SEM). Broad absorption spectrum has found in the visible region with high absorption coefficient and PL spectra show the green emission which is in good agreement with the optical band gap of MAPbBr3 from absorption measurements. With decreasing the size of perovskite materials, band gap and emission spectra tuned towards the blue region. The simultaneous thermal analysis (STA) study indicates towards the more thermal stability of micro-cubes structures than nanoparticles material while the change in enthalpy (ΔH) and specific heat capacity (ΔCp) of nano particle have increased by reducing the particle size of perovskite due to modification of endothermic peaks.

中文翻译：

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甲基溴化铵的新合成工艺及粒径对 CH 3 NH 3 PbBr 3 有机金属钙钛矿光收集器结构、光学和热力学行为的影响

摘要 具有高稳定性的简单、成本有效的生产方法适用于任何有机-无机钙钛矿太阳能电池。目前工作的主要重点是制定和评估基于 CH3NH3PbBr3 微立方体和纳米颗粒的钙钛矿太阳能电池的稳定性。首先，引入了新的合成路线来制备 CH3NH3Br (MABr) 电解质盐，与原始方法相比，该路线耗时少，成本效益高。我们还报道了一种简便的单一溶液工艺来生长大规模 CH3NH3PbBr3 (MAPbBr3) 混合钙钛矿微立方体和纳米颗粒。已经研究了不同尺寸（微立方和纳米颗粒）的钙钛矿材料对结构、光学、热稳定性和降解动力学的影响。MAPbBr3 钙钛矿的 X 射线衍射光谱反映了材料在室温下的高结晶度和立方结构。微立方体和纳米颗粒 MAPbBr3 的表面形貌已从扫描电子显微镜 (SEM) 获得。在可见光区发现了具有高吸收系数的宽吸收光谱，PL 光谱显示出绿色发射，这与吸收测量中 MAPbBr3 的光学带隙非常吻合。随着钙钛矿材料尺寸的减小，带隙和发射光谱向蓝色区域调整。