A spiro-OMeTAD based semiconductor composite with over 100 °C glass transition temperature for durable perovskite solar cells

y Albeit the excellent hole extraction yield and conductivity, a doped molecular semiconductor film composed of the state-of-the-art spiro-OMeTAD is so far unqualified for durable perovskite solar cells at 85 degrees C. We herein blend a commercial polymer poly(9-vinylcarbazole) and a nonvolatile organic salt 4-(tert-butyl)pyridinium bis (trifluromethanesulfonyl)imide with spiro-OMeTAD, yielding a semiconducting composite with high conductivity and high glass transition temperature. The resultant organic composite can be solution-processed into a hole transport layer for 85 degrees C durable perovskite solar cells with over 21% efficiency, due to good control on charge transport resistance, interfacial recombination resistance, and hole extraction yield. Multiple experimental measurements and molecular dynamics modeling jointly unravel the crucial impact of organic coatings on the thermal decomposition of hybrid perovskites from the split-new perspective of gas diffusion modulation.

Automated summary

The study focuses on improving the durability of perovskite solar cells by blending commercial polymer and organic salt with spiro-OMeTAD to create a high-performance organic composite material. This composite material can achieve high efficiency perovskite solar cells at 85 degrees Celsius and shows good control over charge transport, interfacial recombination, and hole extraction. Multiple experimental measurements and molecular dynamics modeling reveal the crucial impact of organic coatings on the thermal decomposition of hybrid perovskites from a new perspective of gas diffusion modulation.