Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 39, Pages 33841-33854Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b09153
Keywords
intersitital Li doping; trap state passivation; ZnO ETL; perovskite solar cell; electron injection barrier; electrode polarization
Funding
- Future Solar Technologies Pty. Ltd.
Ask authors/readers for more resources
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 MA(0.57)FA(0.38)Rb(0.05)PbI(3) (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 ZriO (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-dopecl PSCs also exhibit lower photocurrent hysteresis than ZnO devices, which is investigated with regard to the electrode, polarization phenomena of the fabricated devices.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available