【摘要】 采用一种简便的两步连续沉积新工艺,成功制备出较纯相的CH₃NH₃PbI₃钙钛矿薄膜,考查了退火过程中升温速率对钙钛矿薄膜成膜质量及其与TiO₂薄膜形成平面异质结光伏性能的影响.结果表明,恰当选择升温速率对钙钛矿薄膜的形貌、致密性以及晶粒尺寸等参数的优化至关重要;当调控升温速率为3℃·min^-1时,可获得表面平整、平均晶粒尺寸较大、结构致密的钙钛矿薄膜.该薄膜具有明显改善光吸收特性和载流子抽取效率,进而使其组成的FTO/TiO₂/CH₃NH₃PbI₃/P3HT/Au钙钛矿平面异质结太阳能电池的光电转换效率提高至5.95%.更多还原

【Abstract】 Highly pure phase CH₃NH₃PbI₃ perovskite thin films are successfully fabricated by an improved two-step sequential deposition technique. The influence of different heating rate on photovoltaic performance of perovskite thin films for planar heterojunction with TiO₂ films are particularly investigated under annealing process.The experimental results show that the heating rate for annealing process has a great influence on the surface morphology,grain size and compactness of perovskite films.At a moderate heating rate of 3 ℃·min^-1,high-quality perovskite thin films with smoother surface morphology is obtained perfect compact structure and larger average grain size.The high-quality perovskite thin films have enhanced light absorption and higher charge carriers extraction efficiency,and are further assembled into planar heterojunction perovskite solar cells with FTO/TiO₂/CH₃NH₃PbI₃/P3HT/Au structure improving power conversion efficiency of 5.95%.更多还原