Low-cost molecular glass hole transport material for perovskite solar cells

Abstract

The availability of low-cost hole transport materials (HTMs) that are easy to process is crucial for the eventual commercialization of perovskite solar cells (PSCs), as the commonly used HTM (Spiro-OmeTAD) is expensive, and its processing is complex. In this study, we synthesized an amorphous molecular material (termed as TPA-glass) from the condensation of 2-mexylamino-4-methylamino-6-(4-aminophenylamino)-1,3,5-triazine and N-(4-formylphenyl)diphenylamine with a low-cost and easy process, and applied as an HTM in PSCs. We investigated the effect of TPA-glass thin-films with varying thickness, as well as their corresponding solar cell’s properties. The preliminary performance data indicate that TPA-glass thin-film can be a potential HTM candidate for planar PSCs.

Dopant-Free Mexylaminotriazine Molecular Glass Hole Transport Layer for Perovskite Solar Cells

“…All the HTM precursor solutions were spin-coated on the MAPbI 3 perovskite film at 4000 rpm for 30 s. Solutions of gTPA, gTPA2, gTPA2-OMe, and spiro-OMeTAD in chlorobenzene solution (CB) were prepared by dissolving 10 mg of gTPA, gTPA2, or gTPA2-OMe or 72.3 mg of spiro-OMeTAD in 1 mL of CB by stirring at room temperature for 6 h (Figure S1), respectively. The effect of different molecular glass film thicknesses on the performance of the device has been discussed in the previous work . 100 nm Au was deposited on the HTL for completing the design of the device.…”

“…Recently, our team synthesized a new type of methylaminotriazine derivative (herein named gTPA) by a simple condensation of 2-mexylamino-4-methylamino-6-(4-aminophenylamino)-1,3,5-triazine and N -(4-formylphenyl)­diphenylamine. In order to study the photoelectric properties of the material, we conducted a systematic study on the film thickness of gTPA and achieved a PCE of 2.92% on the traditional MAPbI 3 -based PSCs . To conduct a more in-depth study of this very promising structure (methylaminotriazine) as a HTM for PSCs, we synthesized two novel TPA-containing mexylaminotriazine derivatives (named gTPA2 and gTPA2-OMe, Scheme ) and systematically compared the effect of these three materials on the performance of PSCs.…”

“…In order to study the photoelectric properties of the material, we conducted a systematic study on the film thickness of gTPA and achieved a PCE of 2.92% on the traditional MAPbI 3 -based PSCs. 40 To conduct a more in-depth study of this very promising structure (methylaminotriazine) as a HTM for PSCs, we synthesized two novel TPA-containing mexylaminotriazine derivatives (named gTPA2 and gTPA2-OMe, Scheme 1) and systematically compared the effect of these three materials on the performance of PSCs. The resulting materials exhibit excellent solubility and film-forming ability in common solvents.…”

“…General. 2-Mexylamino-4-methylamino-6-(4-aminophenylamino)-1,3,5-triazine, 37 2-chloro-4-methylamino-6-mexylamino-1,3,5-triazine, N-(4-aminophenyl)diphenylamine, 41 N-(4-aminophenyl)-N,N-bis(4-methoxyphenyl)amine, 42 and gTPA 40 were synthesized as described in the literature. All the commercially available reagents and solvents were purchased and used without further purification.…”

“…The effect of different molecular glass film thicknesses on the performance of the device has been discussed in the previous work. 40 100 nm Au was deposited on the HTL for completing the design of the device. The active area of the PSC was 9 mm 2 .…”