Supramolecular Control over Hybrid Perovskite Self-Assembly for Efficient Solar Cells
Silvia Colella a, Sofia Masi a, Andrea Listorti a, Giuseppe Gigli a, Aurora Rizzo b
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Oral, Silvia Colella, presentation 073
Publication date: 7th November 2016

Halide perovskites (HPs) is becoming the benchmark material for next generation optoelectronics.1–3The exploitation of these materials has in fact embodied a profound revolution of this wide field. Firstly, and most prominently to now, the revolution impacted onsolution processable solar converting devices, herein HPs in the most used organometal lead containing specimens, surpassed every other competing application to silicon.2 This rocketing blossoming has generated intense excitement, but has left many unanswered questions along with several major limitations. Those need to be solved before further progresses towards technological maturation and real market implementations. Among them the intrinsic instability, especially of HPs in the organometallic specimens, the toxicity of lead, the poor control of material properties usually deposited via simple wet processing and the intrinsic mechanical fragility of the polycrystalline films, which clearly treat large area and flexible applications. Here a supramolecular control of the morphology and perovskite crystal growth is presented, aiming at addressing most of the material drawbacks, playing with the profound dependence of the material final properties from its growing process. On this front we explored environmental friendly multifunctional compounds, comprising cyclic carbohydrates and sorbitol derivatives, as active elements for directing the growth of halide perovskites during the self-assembly process and ensuring predictable material properties. A particular attention is devoted to the study of intermolecular interactions occurring in solution deeply modifying the self-assembly process, and their relationship with the properties of the deposited thin film. The function of the additives in perovskite-based solar cells is found to be crucial in influencing crystalline order, morphology and photo-physical properties of the final material. Experimental characterization and photovoltaic applications of different perovskite-based nanocomposites are presented.4–7

(1) Colella, S. et al. The Bright Side of Perovskites. J. Phys. Chem. Lett.2016. ASAP

(2) Zhang, W. et al. Nat. Energy2016, 1, 16048.

(3) Manser, J. S. et al Chem. Rev.2016. ASAP

(4) Masi, S. et al. Sci. Rep.2015, 5, 7725.

(5) Masi, S. et al. Nanoscale2015, 7, 18956–18963.

(6) Masi, S.; Rizzo, A.; Munir, R.; Listorti, A.; Giuri, A.; Corcione, C. E.; Treat, N.; Amassian, A.; Stingelin, N.; Gigli, G.; Colella, S. Organic Gelators as Growth Control Agents for Highly Efficient Hybrid Perovskite-Based Solar Cells, 2017, in preparation.

(7) Masi, S.; Aiello, F.; Balzano; Listorti, A.; Federica; Uccello-Barretta, G.; Gigli, G.; Rizzo, A.; Colell, S. Cyclodextrin-Driven Supramolecular Control over Perovskite Formation for Highly Efficient Solar Cells, 2017. Under review

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