Abstract
Solvent engineering as a crucial factor in determining the photovoltaic performance of perovskite solar cells has attracted much attention in recent years. Herein, we treat PbI 2 and perovskite films with isopropyl alcohol, acetone, diethyl ether and dichloromethane, as standard solvents, in a modified two-step method. Meanwhile, triethylenetetramine (TETA) is introduced as a new reagent in solvent engineering for perovskite solar cell devices. Structural, optical and photovoltaic characteristics of the TETA-treated perovskite films are compared with those of the ones treated with different solvents. A shiny, pinhole-free and full-coverage texture with sufficiently large grain sizes is obtained in the presence of TETA, suggesting an efficient solvent engineering for perovskite layers. Moreover, the results reveal that residual PbI 2 is completely removed and converted to a crystalline perovskite film. Amongst the PSC devices engineered with various solvents, the TETA-treated film exhibits a 55% increase in photoconversion efficiency compared to the control device with no solvent engineering.
| Original language | English |
|---|---|
| Pages (from-to) | 1228-1234 |
| Number of pages | 7 |
| Journal | Photochemical and Photobiological Sciences |
| Volume | 18 |
| Issue number | 5 |
| Early online date | 28 Feb 2019 |
| DOIs | |
| Publication status | Published - 1 May 2019 |
Keywords
- perovskite solar cells
- hole-transporter free
- fully-printable components
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
