Methylammonium-and bromide-free perovskites enable efficient and stable photovoltaics

• 作者: Saisai Li Tingwei He Yuanzhi Jiang Mingjian Yuan
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（12）
• 页码范围: 12-24
• 页数: 13页
• 语种: 英文

摘要

Hybrid perovskite solar cell (PSC) has attracted extensive research interest due to its rapid increase in efficiency,regarding as one of the most promising candidates for the next-generation photovoltaic tech-nology.The certified power conversion efficiency of the devices based on formamidinium lead iodide(FAPbI3) perovskite has reached 25.5％,approaching the record of monocrystalline silicon solar cells.Unfortunately,the black α-phase FAPbI3 materials can spontaneously transform to non-optically active δ-phase at room temperature,which greatly hinder their photovoltaic application.In order to overcome this problem,various strategies,especially introducing methylammonium (MA+),caesium (Cs+) and bro-mide (Br-) ions into the materials,have been widely adopted.However,MA+ can largely reduce the ther-mal stability of the materials.Furthermore,the introduction of Br can enlarge the materials' bandgap,resulting in a reduced theoretical efficiency.Keeping these in mind,developing the strategies which without using MA+ and Br-is the inevitable trend.Here,we focus on the recent progresses of stabilizing α FAPbI3 without employing MA+ and Br,and discuss the advantages of inorganic ions doping and dimensionality engineering to stabilized α FAPbI3.Meanwhile,in order to deeply understand the rela-tionship between the semiconducting properties and device performance of the corresponding materials,we then summarize several significant strategies to suppress the non-radiation recombination,such as interface modification and trap passivation.Finally,we propose to develop more effective 'A-site'alter-natives to stabilize αFAPbI3,which is expected to achieve high-efficient PSCs with long-term stability,facilitating its commercialization process.