Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 19, Pages 17555-17562Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b03810
Keywords
photovoltaics; hybrid perovskite; formamidinium; methylammonium; 3-chloropropylamine chloride; zinc iodide; chloride additive
Funding
- Erasmus + exchange program
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We present a one-step method to produce air-stable, large-grain mixed cationic lead perovskite films and powders under ambient conditions. The introduction of 2.5 % of Zn(II), confirmed by X-ray diffraction (XRD), results in stable thin films which show the same absorption and crystal structure after 2 weeks of storage under ambient conditions. Next to prolonged stability, the introduction of Zn(II) affects photophysical properties, reducing the bulk defect density, enhancing the photoluminescence (PL), and extending the charge carrier lifetime. Furthermore, 3-chloropropylamine hydrochloride is applied as the film-forming agent. The presence of this amine hydrochloride additive results in highly oriented and large crystal domains showing an ulterior improvement of PL intensity and lifetime. The material can also be prepared as black precursor powder by a solid-solid reaction under ambient conditions and can be pressed into a perovskite pellet. The prolonged stability and the easy fabrication in air makes this material suitable for large-scale, low-cost processing for optoelectronic applications.
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