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Azatruxene-Based, Dumbbell-Shaped, Donor-π-Bridge-Donor Hole-Transporting Materials for Perovskite Solar Cells
Luis A Illicachi1, Javier Urieta-Mora2,3, Joaquín Calbo4
1Center for Research and Innovation in Bioinformatics and Photonics-CIBioFi, Grupo de Investigación de Compuestos Heterocíclicos, Universidad del Valle, Calle 13 No. 100-00, Edificio E20, Cali, Colombia.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 2, 2020
Summary
Three novel donor-π-bridge-donor hole-transporting materials (HTMs) were synthesized and tested in perovskite solar cells (PSCs). DTTX-1 and DTTX-2 achieved high power conversion efficiencies, showing potential as alternatives to spiro-OMeTAD.
Area of Science:
- Materials Science
- Photovoltaics
- Organic Chemistry
Background:
- Hole-transporting materials (HTMs) are crucial for efficient perovskite solar cells (PSCs).
- Developing novel HTMs with improved properties is essential for advancing PSC technology.
- Current HTMs like spiro-OMeTAD face challenges in stability and cost.
Purpose of the Study:
- To synthesize and characterize novel donor-π-bridge-donor (D-π-D) HTMs based on triazatruxene and EDOT linkers.
- To evaluate the performance of these new HTMs in mesoporous PSCs.
- To investigate the structure-property relationships influencing the optoelectronic characteristics of the synthesized materials.
Main Methods:
- Synthesis and characterization of three novel D-π-D HTMs (DTTX-1, DTTX-2, DTTX-3).
- Fabrication of mesoporous PSCs using a triple-cation perovskite absorber.
- Device performance testing under standard solar illumination (AM 1.5G) and characterization of optoelectronic properties (conductivity, hole mobility, photoluminescence).
Main Results:
- DTTX-1 and DTTX-2 exhibited excellent performance in PSCs, with power conversion efficiencies (PCEs) of 17.48% and 18.30%, respectively, comparable to spiro-OMeTAD (18.92%).
- The optoelectronic properties, including absorption, emission, and donor ability, were tuned by modifying the EDOT linker structure, with extended π-conjugation in DTTX-2 leading to improved performance.
- DTTX-3 showed a lower PCE (12.68%) attributed to poor film formation, despite exhibiting intramolecular charge transfer and significant redshift.
Conclusions:
- The novel DTTX-based HTMs, particularly DTTX-1 and DTTX-2, demonstrate significant potential as efficient alternatives to spiro-OMeTAD in mesoporous PSCs.
- The structural design of the EDOT linker plays a critical role in determining the optoelectronic properties and device performance.
- Further optimization of film formation could enhance the performance of DTTX derivatives in future PSC applications.
