Hybrid Perovskite Solar-Cell Absorbers with Enhanced Moisture Stability

Hemamala Karunadasa^a

^aStanford University, Stanford, CA 94305, United States

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Oral, Hemamala Karunadasa, presentation 154
Publication date: 5th February 2015

Although remarkable progress has been achieved in efficiencies of solar cells containing hybrid perovskite absorbers, the moisture sensitivity of the material remains a concern for large-scale device fabrication and their long-term use. I will present our recent results on structural modifications at the atomic level that improve the moisture stability of perovskites and provide additional routes for tuning the properties of these versatile materials. For example, we have shown for the first time that the structurally related two-dimensional hybrid perovskites can be tuned to serve as solar-cell absorbers. These materials consist of alternating layers of inorganic and organic components, where the thickness of the inorganic sheets can be systematically varied. Here, the organic components can be designed to repel moisture while the inorganic layers absorb sunlight to produce photocurrent. Our first-generation thin-film devices containing (PEA)₂(MA)₂[Pb₃I₁₀] (1, PEA = C₆H₅(CH₂)₂NH₃⁺, MA = CH₃NH₃⁺) show a high open-circuit voltage of 1.18 V and a power-conversion efficiency of 4.73%. The layered structure allows for high-quality films to be deposited through one-step spincoating and high-temperature annealing is not required for device fabrication. Importantly, films of 1 are significantly more moisture resistant than films of (MA)[PbI₃] and devices containing 1 can be fabricated under ambient humidity levels. The larger bandgap of the 2D structure is also suitable for the higher bandgap absorber in a dual-absorber tandem device. I will discuss how, compared to (MA)[PbI₃], the layered 2D perovskite structure may offer greater tunability at the molecular level for material optimization. I will also present new synthetic methods recently developed in our lab to improve the film quality and moisture resistance of 3D hybrid perovskites.

Smith, I. C.; Hoke, E. T.; Solis-Ibarra, D.; McGehee. M. D.; Karunadasa, H. I. A layered hybrid perovskite solar cell absorber with enhanced moisture stability. Angew. Chem., Int. Ed. 2014, 53, 11232.

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