2021 Angew. Chem. Int. Ed.: 21.10% High Performance PSC! Application of Hole-Transport Materials

SS-X solar simulator makes the breakthrough possible!

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  Angewandte Chemie (IF 15.336) published a study in November 2021.Intramolecular noncovalent interactions (INIs) have served as an effective strategy to obtain organic semiconductors with enhanced charge transport properties. Here, the authors exploited the INI strategy to develop a dopant-free hole-transporting materials (HTMs) by constructing two small-molecule HTMs with INI-integrated backbone for high-performance perovskite solar cells (PVSCs).

  Upon incorporating noncovalent S…O interaction into the simple-structured backbone, the resulting two structures of BTORA and BTORCNA containing HTM molecules exhibit self-planarized backbones, tunable energy levels, enhanced thermal properties, appropriate film morphology and effective defect passivation. More importantly, the high thin film crystallinity endows the materials with substantial hole mobilities, making them as promising dopant-free HTMs.

2021 Angew. Chem. Int. Ed.: 21.10% High Performance PSC! Application of Hole Transport Materials Detailed synthesis routes to BTRA BTORA and BTORCNA

Enlitech’s solar simulator,QE-R Quantum Efficiency Measurement system and other instruments were used in this study to assist in the measurement. It was found that the BTORCNA-based inverted PVSCs had a power conversion efficiency of 21.10% and long-term device stability. This result is better than the device based on BTRA without S…O interaction (18.40%). This study provides an practical method for designing charge transporting layers with high intrinsic mobilities for high-performance PVSCs.

In addition to the EQE (External Quantum Efficiency) spectrum analysis of solar cells, the Quantum Efficiency Measurement System of Enlitech also provides Jsc (short-circuit current density) comparison for the short-circuit current of solar cells under the solar simulator to prove the authenticity of the experiment. The solar simulator and KA-6000 software of Enlitech also provide monitoring of the short-circuit current over time to prove the stability of the solar cell!

Intramolecular noncovalent interactions perovskite solar cell

By incorporating intramolecular S⋅⋅⋅O noncovalent interactions (INIs) for boosting the intrinsic hole mobilities, two simple-structured dopant-free hole-transporting materials (HTMs) were designed and delivered a remarkable efficiency of 21.10 % with decent device stability in inverted perovskite solar cells.

J-V curves BTRA BTORA and BTORCNA perovskite solar cell

The J-V curves of PVSCs based on (b) BTRA, (c) BTORA, and (d) BTORCNA under continuously scanning for 15 times. The inserts show the decline of Jsc or Voc values upon the increase of scanning time.

Keywords: hole-transporting material, perovskite solar cell, Solar Simulator, Quantum Efficiency, Sun Simulator

Article link: https://doi.org/10.1002/anie.202113749

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