Optimization of Bulk Defects in Sn/Pb Mixed Perovskite Solar Cells Through Synergistic Effect of Potassium Thiocyanate. Issue 12 (29th October 2020)

• Record Type: Journal Article
• Authors: Chen, Qin; Wu, Jiawei; Matondo, Jadel Tsiba; Bai, Luyun; Maurice, Davy Malouangou; Guli, Mina
• Is Part Of: Solar RRL. Volume 4:Issue 12(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-10-29
• Subjects: defects -- potassium thiocyanate -- synergistic effects -- tin–lead mixed perovskite solar cells; Solar energy -- Periodicals; Photovoltaic power generation -- Periodicals; Solar energy -- Research -- Periodicals; Photovoltaic power generation -- Research -- Periodicals; Periodicals; 333.7923
• DOI: 10.1002/solr.202000584
• Languages: English
• ISSNs: 2367-198X

Abstract

Abstract : The organic–inorganic Sn–Pb mixed perovskite has achieved great progress during the last 10 years and is considered as one of the most promising low‐bandgap photovoltaic materials. It has lower toxicity, outstanding optoelectrical properties, and achieved remarkable performance. However, there are still plenty of challenges in controlling the morphology, crystallinity, and defects of the Sn–Pb mixed perovskite film because of the inferior chemical stability of Sn compared with Pb. Herein, it is found that the synergistic effect of potassium thiocyanate (KSCN) in the Sn–Pb mixed perovskites can enlarge the grain size, enhance the crystallization, improve the film morphology, and obtain high‐quality perovskite films which effectively eliminate the bulk defects and smooth carrier transportation of Sn–Pb mixed perovskite solar cells. Through optimizing the concentration of KSCN, a high‐performance MA0.5 FA0.5 Pb0.5 Sn0.5 I3 solar cell with an efficiency of 15.14% and improved stability is obtained. This work lays a key foundation for the fabrication of efficient and stable Sn‐based or Sn–Pb mixed perovskite solar devices. Abstract : Due to the poor morphology and crystallinity of Sn–Pb mixed perovskites, it is found that the addition of potassium thiocyanate (KSCN) can effectively reduce the bulk defects and carrier recombination through optimizing the process of film formation and the perovskite film quality. Therefore, a whole improvement of device performance can be achieved under the optimization effect of KSCN doping.