@Article{jrm.2023.027730,
AUTHOR = {Qixian Zhang, Yi Guo, Huicong Liu, Weiping Li, Liqun Zhu, Haining Chen},
TITLE = {Treating CsPbI<sub>3</sub> Perovskite with Pyrrolidinium Iodide to Improve the Performance of Perovskite Solar Cells},
JOURNAL = {Journal of Renewable Materials},
VOLUME = {11},
YEAR = {2023},
NUMBER = {8},
PAGES = {3193--3201},
URL = {http://www.techscience.com/jrm/v11n8/53380},
ISSN = {2164-6341},
ABSTRACT = {All-inorganic CsPbI<sub>3</sub> perovskite has attracted wide attention due to its desirable optical bandgap (<i>E<sub>g</sub></i>: ∼1.7 eV) as
well as high chemical stability. Nevertheless, the photovoltaic performance of CsPbI<sub>3</sub> perovskite solar cells (PSCs)
was limited by severe nonradiative charge recombination due to high defect density at the grain boundary and
surface of perovskite films. To address this issue, a pyrrolidinium iodide (PyI) molecule was introduced to modify
the surface and grain boundary of CsPbI<sub>3</sub> perovskite films to passivate defects, which improves the quality of
CsPbI<sub>3</sub> perovskite films as well as induces the generation of a quasi-2D Py<sub>2</sub>CsPb<sub>2</sub>I<sub>7</sub> capping layer between perovskite layer and hole transport layer. Such quasi-2D Py<sub>2</sub>CsPb<sub>2</sub>I<sub>7</sub> capping layer optimizes interface contact
between CsPbI<sub>3</sub> perovskite layer and hole transport layer and blocks the electron transfer from CsPbI<sub>3</sub> perovskite
photoactive layer to the hole transport layer. As a result, the performance of CsPbI<sub>3</sub> PSCs is well improved to
17.87% for power conversion efficiency (PCE) with an ultra-high fill factor (FF) of 0.84. In addition, the PyI molecule modified CsPbI<sub>3</sub> perovskite devices exhibit excellent stability, which remains its initial PCE almost
unchanged after aging for 35 days under the dry air atmosphere (temperature: 20°C–30°C, control relative humidity (RH): <10%).},
DOI = {10.32604/jrm.2023.027730}
}