HomeProjectsSustainable Development and Green TechnologiesNew Generation Ligand – Perovskite Inks for Photovoltaics (PV) and Light-Emitting Diode (LED)

New Generation Ligand – Perovskite Inks for Photovoltaics (PV) and Light-Emitting Diode (LED)

Project Quick Facts

Principal Investigator

  • Prof. XU Jianbin

    Department of Test

  • Prof. YAN Keyou

    Department of Electronic Engineering

  • Funding

    Research Grants Council of Hong Kong

Solution processed perovskite is a new generation thin film technology with solution inks for photovoltaics (PV) and light emitting diode (LED), suitable for application using printing and coating techniques. The world record photoelectric conversion efficiency (PCE) of perovskite-coated PV lies between silicon solar cell (first generation, 26.7%) and thin film solar cell (second generation, ~22%). The luminescent properties, i.e. colour tunability and external quantum efficiency (EQE), of perovskite-based LED are comparable to those of OLED. However, due to its instability, the widespread commercialization of perovskite solar cells is hindered.

We developed a series of ligand-perovskite inks using “non-stoichiometric acid-base reaction (NABR)” that reduce the efficiency-stability-scalability-cost gap of PV/LED devices by half. The inks can be coated on substrates regardless of whether they are rigid or flexible with high throughput. It can be fabricated easily into scalable, flexible and ultrathin films, which is more competitive than nonelastic silicon solar cells. This ligand-perovskite ink technology is promising to be cost-efficiently utilised in the future PV/LED market and would be of great interest to PV/OLED companies as perspective strategies for future development.

Solution inks for PV and LED

Uniqueness and Competitive Advantages:

  • Ligand stabilises the perovskite precursor through coordination and enhances the thin film quality during deposition by controlling the intermediate
  • The use of the ink depends on the fabricated device and the in-detail parameters can be customised, for instance, 500nm thick film for high performance PV solar panels and 50-100nm for LED devices
  • The gas-solid reaction process and reactor developed by the team was able to fabricate large-area perovskite thin film (5 × 5 cm2) with dense structure, which substantially fostered their potential in commercial applications
  • Advantages include the low-cost raw material, simple packaging technology, high power conversion efficiency and switchable PV-LED functions

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