Efficient Bulk-Heterojunction Solar Cells Based on a Symmetrical D-π-A-π-D Organic Dye Molecule

Citations Over TimeTop 10% of 2009 papers

Abstract

A symmetrical D-π-A-π-D organic dye molecule 2-{2,6-bis-[2-(4-diphenylamino-phenyl)-vinyl]-pyran-4-ylidene}-malononitrile (DADP) has been introduced into solution-processable organic solar cells (S-P OSCs). Detailed investigations on the relationship between its molecular structure and thermal, photophysical, electrochemical properties and electronic structure are described. The optimized bulk heterojunction solar cell based on DADP as donor and PCBM as acceptor with the configuration of ITO/PEDOT/DADP:PCBM/LiF/Al exhibits a Voc of 0.98 V, Isc of 4.16 mA/cm2, FF of 0.37, and power conversion efficiency (PCE) of 1.50% under the illumination of AM 1.5 simulated solar light (100 mW/cm2). It was noted that the PCE of the device based on DADP is almost double that of the device based on TPA-DCM-TPA, an analogue of DADP, although there is only a small difference between their molecular structures; DADP has a shorter distance between the triphenylamine (TPA) group and the 2-pyran-4-ylidenemalonitrile (PM) group than TPA-DCM-TPA. This small structural difference results in a lower-lying highest occupied molecular orbital (HOMO) energy level and higher hole mobility in DADP, and ultimately leads to the increased PCEs of the DADP-based devices.

Related Papers

• → 17.1%-Efficiency organic photovoltaic cell enabled with two higher-LUMO-level acceptor guests as the quaternary strategy(2020)44 cited
• → In Silico Designing of Thieno[2,3-b]thiophene Core-Based Highly Conjugated, Fused-Ring, Near-Infrared Sensitive Non-fullerene Acceptors for Organic Solar Cells(2023)14 cited
• → Starburst Triphenylamine‐Based Donor–Acceptor‐Type Small Molecules for Solution‐Processed Organic Solar Cells(2015)10 cited
• → Theoretical Study on Understanding the Effects of Core Structure and Energy Level Tuning on Efficiency of Nonfullerene Acceptors in Organic Solar Cells(2021)8 cited
• → Third component with a high LUMO energy level enables 17.69% efficiency in ternary organic solar cells(2022)2 cited