Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 124, Issue 30, Pages 16289-16299Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.0c03401
Keywords
-
Funding
- National Foundation for Science and Technology Development of China (973 project) [2015CB932203]
- National Key Research and Development Program of China [2017YFB0404501]
- National Major Fundamental Research Program of China [91833306]
- National Natural Science Foundation of China [61505086, 61705111, 61704091]
- Science Fund for Distinguished Young Scholars of Jiangsu Province of China [BK20160039]
- Natural Science Foundation of Jiangsu Province [BM2012010, BK20170899]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [YX030003]
- Synergetic Innovation Center for Organic Electronics and Information Displays
- Research Grants Council (RGC) of Hong Kong [24306318]
- CUHK Direct Grant [4053347]
Ask authors/readers for more resources
An organic cationic salt, hexamethylenediamine diiodide (HDADI), is introduced into formamidinium tin iodide (FASnI(3)) perovskite solar cells (PSCs) by consideration of amino group passivation of HDA(2+) to iodide of SnI64- and assisted links of amino groups at both ends of HDA(2+) to the perovskite unit cell to form the Dion-Jacobson (DJ) layered two-dimensional (2D) perovskite. X-ray diffraction and grazing-incidence wide-angle X-ray scattering characteristics exclude the formation of the DJ layered 2D perovskite. A decent power conversion efficiency (PCE) and stability are derived from the high-quality perovskite films with large coverage, high crystallinity, and disappeared pinholes as well as increased radiative recombination and a prolonged carrier lifetime, which are associated with the interaction of NH3+ and SnI64- octahedra via a hydrogen bond. The interaction not only neutralizes charged defects or dangling bonds of perovskites but also forms a shield to retard the oxidation of Sn2+ to Sn4+ and reduce Sn vacancies. Applications of the HDADI-treated FASnI(3) films into PSCs acquire a champion PCE of 7.6% and an outstanding long-term stability of over 550 h to retain 80% of the initial efficiency in a glovebox with a N-2 environment. This work may guide the design of highly stable and efficient Sn-based PSCs.
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