Chen Shangshang of Nanjing University in Science Advances: 26.0%! Poly-SAMs Enable UV-Stable, High-Efficiency Perovskite Solar Modules!

Ultraviolet (UV) radiation poses a significant challenge to the stability of ubiquitous p-i-n perovskite solar cells (PSCs), as light is incident from the hole-transport-layer side, necessitating a more robust hole-transport layer.

Based on this, Chen Shangshang and others from Nanjing University It has been revealed that commonly used self-assembled monolayer (SAM)-type hole transport layers (HTLs) exhibit poor UV stability, which can cause irreversible damage to hole extraction and compromise device stability. To address this issue, the authors have developed a polymer-based, UV-stabilized HTL named Poly-2PACz. Compared with SAM-type HTLs, Poly-2PACz HTL demonstrates strong interfacial adhesion to the substrate and superior UV resistance. Under ambient conditions, Solution-processed PSCs employing Poly-2PACz HTL achieved a remarkable efficiency of 26.0% and excellent UV stability. The battery retains 80% of its initial power conversion efficiency even after approximately 500 hours of exposure to high-intensity ultraviolet radiation. In addition, Poly-2PACz exhibits excellent wettability and high electrical conductivity, enabling the fabrication of blade-coated micro-modules with a 22.2% aperture efficiency and outstanding uniformity. This Recent paper Titled “Efficient perovskite solar modules enabled by a UV-stable and high-conductivity hole transport material” The paper was published in a journal. Science Advances Up.

Device Fabrication

ITO/SAM/PVSK/PDI/C₆₀/BCP/Cu

1. Wash the ITO glass thoroughly, then expose it to ozone for 15 minutes prior to use. Next, spin-coat a solution of either 2 PACz or Poly-2 PACz in methanol (methanol:chloroform = 1:1) onto the ITO substrate at a spin speed of 20 mm s⁻¹, followed by thermal annealing in air at 100°C for 1 At 0 minutes, the gap between the blade tip and the substrate is 150 μm;

2. 1.35 M MA0.7FA0.3PbI3 Dissolved in 2-ME, with ammonium dodecyl iodide solution (0.83 mg mL−1), LP (0.27 mg mL−1), 0.14% (v/v) MAH2PO2, p-F-PEAI (1.4 mg mL−1), BHC (0.15 mg mL−1), and 2.8% (v/v) DMSO as additives; scrape Coating speed is 20. mm/s, with a coating gap of 230 μm; during the doctor-blading process, the blade pressure is approximately 138 kPa, followed by annealing at 120 °C for 10 minutes.

3. Evaporate 30 nm of C ₆₀ , 6 nm BCP and 100 nm Cu. The PSC was then encapsulated with a cover glass sealed using a two-part epoxy sealant. The active area of the solar cell is 8.0 mm².

Modules: For perovskite micro-modules, the laser power for P2 and P3 scribing is approximately 0.375 W. The champion module based on Poly-2PACz comprises six subcells, each with a width of 6 mm.