Concentration-dependent impact of alkali Li metal doped mesoporous TiO.sub.2./sub. electron transport layer on the performance of CH.sub.3./sub.NH.sub.3./sub.PbI.sub.3./sub. perovskite solar cells

0520178 - FZÚ 2020 RIV US eng J - Journal Article
Amalathas, A.P. - Landová, Lucie - Conrad, B. - Holovský, Jakub
Concentration-dependent impact of alkali Li metal doped mesoporous TiO₂ electron transport layer on the performance of CH₃NH₃PbI₃ perovskite solar cells.
Journal of Physical Chemistry C. Roč. 123, č. 32 (2019), s. 19376-19384. ISSN 1932-7447. E-ISSN 1932-7455
R&D Projects: GA ČR GA18-24268S
Institutional support: RVO:68378271
Keywords : low-temperature * enhancing efficiency * halide perovskites * selective contact * rutile TiO2 * stability * hysteresis * interface * iodide
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 4.189, year: 2019
Method of publishing: Limited access
https://doi.org/10.1021/acs.jpcc.9b05355

TiO2 is commonly employed as an electron transport layer (ETL) in mesoscopic n−i−p perovskite solar cells (PSCs). However, the low electron mobility, low electrical conductivity, and high electronic trap states of TiO2 have negative impacts on further enhancement of PSC performance. Metal doping is an efficient way to improve the electronic properties of TiO2 films. In this work, we investigate the concentration-dependent impact of alkali lithium metal doping of the mesoporous TiO2 ETL on the performance of mesoscopic CH3NH3PbI3 PSCs. It was found that Li doping results in improvement in electrical conductivity and electron mobility and reduces the number of electronic trap states arising due to the oxygen vacancies within TiO2 lattice. The device performance relies on the concentration of Li doping, and the power conversion efficiency (PCE) of the PSC was improved from 13.64% to 17.59% for a Li doped mesoporous TiO2 layer with an optimized concentration of 30 mg/mL.

Permanent Link: http://hdl.handle.net/11104/0304867