Guanidinium induced phase separated perovskite layer for efficient and highly stable solar cells

Guanidinium (GA) has been proposed as an effective organic cation in improving the stability of lead halide perovskite solar cells (PSCs). However, the reported efficiency of GA based PSCs is far behind traditional GA-free devices. Herein, a novel GA doped quadruple cation perovskite, Cs 0.05 (FA 0....

Full description

Saved in:
Bibliographic Details
Published inJournal of materials chemistry. A, Materials for energy and sustainability Vol. 7; no. 16; pp. 9486 - 9496
Main Authors Zhang, Weihai, Xiong, Juan, Li, Jinhua, Daoud, Walid A.
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 2019
Subjects
Cations
Lead
Metal halides
Optoelectronics
Perovskites
Phase separation
Photovoltaic cells
Solar cells
Stability
Online AccessGet full text

Cover

More Information
Summary:Guanidinium (GA) has been proposed as an effective organic cation in improving the stability of lead halide perovskite solar cells (PSCs). However, the reported efficiency of GA based PSCs is far behind traditional GA-free devices. Herein, a novel GA doped quadruple cation perovskite, Cs 0.05 (FA 0.83 (MA 1−x GA x ) 0.17 ) 0.95 Pb(I 0.83 Br 0.17 ) 3 (CsFAMA 1−x GA x ), is presented. It is found that the introduction of GA induces a phase separation of 3D CsFAMA 1−x GA x , 2D FAGAPbI 4 , and 1D δ-FAPbI 3 . By tuning the content of GA, a δ-FAPbI 3 /CsFAMA 1−x GA x (1D/3D) perovskite with superior optoelectronic properties is demonstrated. The novel 1D/3D perovskite shows an overall improvement in stability. The corresponding solar cell exhibits a PCE of 20.29% with negligible hysteresis, being the highest reported efficiency for GA based PSCs thus far. This study introduces a new perovskite model toward efficient and highly stable PSCs.
ISSN:2050-7488
2050-7496
DOI:10.1039/C9TA01893J