甲脒
材料科学
兴奋剂
介电谱
光电流
能量转换效率
锂(药物)
钙钛矿太阳能电池
钙钛矿(结构)
铷
光电子学
电极
化学工程
电化学
化学
物理化学
内分泌学
冶金
工程类
医学
钾
作者
Arafat Mahmud,Naveen Kumar Elumalai,Mushfika Baishakhi Upama,Dian Wang,Arman Mahboubi Soufiani,Matthew Wright,Xu Cheng,Faiazul Haque,Ashraf Uddin
标识
DOI:10.1021/acsami.7b09153
摘要
The current work reports the lithium (Li) doping of a low-temperature processed zinc oxide (ZnO) electron transport layer (ETL) for highly efficient, triple-cation-based MA0.57FA0.38Rb0.05PbI3 (MA: methylammonium, FA: formamidinium, Rb: rubidium) perovskite solar cells (PSCs). Lithium intercalation in the host ZnO lattice structure is dominated by interstitial doping phenomena, which passivates the intrinsic defects in ZnO film. In addition, interstitial Li doping also downshifts the Fermi energy position of Li-doped ETL by 30 meV, which contributes to the reduction of the electron injection barrier from the photoactive perovskite layer. Compared to the pristine ZnO, the power conversion efficiency (PCE) of the PSCs incorporating lithium-doped ZnO (Li-doped) is raised from 14.07 to 16.14%. The superior performance is attributed to the reduced current leakage, enhanced charge extraction characteristics, and mitigated trap-assisted recombination phenomena in Li-doped devices, thoroughly investigated by means of electrochemical impedance spectroscopy (EIS) analysis. Li-doped PSCs also exhibit lower photocurrent hysteresis than ZnO devices, which is investigated with regard to the electrode polarization phenomena of the fabricated devices.
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