Abstract
Four novel polymeric metal complexes with a D–A–π–A motif, BDTT-PY-Cd, BDTT-PY-Zn, BDTT-PY-Cu and BDTT-PY-Ni, were designed, synthesized and characterized. These polymeric metal complexes were made up with Cd(II), Zn(II), Cu(II), Ni(II) complexes, thienylbenzo-[1,2-b:4,5-b'] dithiophene (BDTT) and the 8-quinolinol derivative, which were used severally as dye sensitzers’ auxiliary electron acceptors (A), electron donor (D) and π bridges as well as the acceptors (A). Under AM 1.5 irradiation (100 mW cm−2), the devices of dye sensitized solar cells (DSSC) based on four polymer complexes exhibited short-circuit photocurrent densities (Jsc) of 17.45 mA cm−2, 14.75 mA cm−2, 13.94 mA cm−2 and 12.00 mA cm−2, as well as attractive power conversion efficiencies (PCE) of were 9.73%, 8.02%, 6.82% and 6.12%, respectively. The photovoltaic conversion efficiency (PCE) and short-circuit photocurrent density (Jsc) of BDTT-PY-Cd, BDTT-PY-Zn, BDTT-PY-Cu and BDTT-PY-Ni decrease in order because the radius and charge number of the metal ion affect the strength of the coordination bond between the metal ion and the ligand. These results provides a new way of development for efficient and stable dye sensitizers in the future.
Highlights
Dye-sensitised solar cells (DSSCs) are a kind of organic solar cell proposed by Gratzel and O'regan in 1991 [1], have received continuous attention from a large number of researchers in recent years due to their simple and inexpensive manufacturing process, light weight and continuous breakthroughs in photoelectric conversion efficiency [2,3]
Under AM 1.5 irradiation (100 mW cm-2), the devices of dye sensitized solar cells (DSSC) based on four polymer complexes exhibited short-circuit photocurrent densities (Jsc) of 17.45 mA cm-2, 14.75 mA cm-2, 13.94 mA cm-2, and 12.00 mA cm-2, as well as attractive power conversion efficiencies (PCE) of were 9.73 %, 8.02 %, 6.82 % and 6.12 %, respectively
The photovoltaic conversion efficiency (PCE) and short-circuit photocurrent density (Jsc) of BDTT-PY-Cd, BDTT-PY-Zn, BDTT-PY-Cu and BDTT-PY-Ni decrease in order because the radius and charge number of the metal ion affect the strength of the coordination bond between the metal ion and the ligand
Summary
Dye-sensitised solar cells (DSSCs) are a kind of organic solar cell proposed by Gratzel and O'regan in 1991 [1], have received continuous attention from a large number of researchers in recent years due to their simple and inexpensive manufacturing process, light weight and continuous breakthroughs in photoelectric conversion efficiency [2,3]. Dye sensitizers have mainly been divided into the following two categories: 1) Metal organic dyes: Ruthenium (Ru(II)) complexes are considered to be the most successful and representative dye sensitizers for DSSCs due to its wide-range solar absorption spectra and good photovoltaic performance [5,6,7] It has the following disadvantages: i) limited absorption in the NIR region of the spectrum; ii) complexed purification steps; iii) limited resources of precious metals [8,9]. 2) Metal-free organic dyes: donor-π-bridge-acceptor (D-π-A) structures are common for organic dyes and show higher efficiency, better push-pull balance and enhanced light absorption in p-type DSSCs compared to Ru(II) complexes [9,10,11] This structure has its own drawbacks, such as low thermal stability, narrow absorption range, and charge recombination [12,13]. What’s more, systematical study of the influence about metal complexes’ coordination bonds in different strength on the photovoltaic performance was investigated
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