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Daniela Cavalcoli

Professoressa associata

Dipartimento di Fisica e Astronomia

Settore scientifico disciplinare: FIS/03 FISICA DELLA MATERIA

Didattica

Argomenti di tesi proposti dal docente.

TESI per Laurea Magistrale in Physics, Curriculum MANO.

Advanced semiconductor thin films for sensor applications.

Innovative perovskites thin films are becoming more and more attracting for several applications. In particular, methylammonium lead iodide perovskite (CH3NH3PbI3) has recently demonstrated to be a very interesting material applications in solar cells and radiation sensors applications [1,2]. However, notwithstanding encouraging results in applications, perovskites still suffer from stability problems when used as transport layer in thin film solar cells, and one of the possible causes of the stability issue should be found in the presence of defect states [3,4].

The research activity aims to monitor defect states and compositional changes of the perovskite layers. The analyses will be carried out by electrical and optical characterization methods (temperature dependent current-voltage and capacitance voltage analyses), charge spectroscopy techniques (Deep Level Transient Spectroscopy, Photo induced transient spectroscopy) and Surface Photovoltage Spectroscopy.

The activity will be carried out in at the Bologna Semiconductor Physics Group of the Physics and Astronomy Dept. Internships abroad are also available on request. For further information on the research activity please visit the group website [5].

  1. M. A. Green, A. Ho-Baillie, H. J. Snaith, The emergence of perovskite solar cells. Nat. Photonics 8, 506–514 (2014). 10.1038/nphoton.2014.134
  2. Haotong Wei, Yanjun Fang, Padhraic Mulligan, William Chuirazzi, Hong-Hua Fang, Congcong Wang, Benjamin R. Ecker, Yongli Gao, Maria Antonietta Loi, Lei Cao & Jinsong Huang; “Sensitive X-ray detectors made of methylammonium lead tribromide perovskite single crystals” Nature Photonics volume 10, pages 333–339 (2016)
  3. Sung Heo, Gabseok Seo, Yonghui Lee,c, Dongwook Lee, Minsu Seol, Jooho Lee, Jong-Bong Park, Kihong Kim, Dong-Jin Yun, Yong Su Kim, Jai Kwang Shin, Tae Kyu Ahn and Mohammad Khaja Nazeeruddin, “Deep level trapped defect analysis in CH3NH3PbI3 perovskite solar cells by deep level transient spectroscopy” Energy Environ. Sci., 10, 1128, (2017).
  4. Sung HeoGabseok SeoYonghui LeeMinsu SeolSeong Heon KimDong‐Jin YunYongsu KimKihong KimJunho LeeJooho Lee,Woo Sung JeonJai Kwang ShinJucheol ParkDongwook Lee Mohammad Khaja Nazeeruddin; “Origins of High Performance and Degradation in the Mixed Perovskite Solar Cells” Adv Mater. 2019.
  5. https://site.unibo.it/semiconductor-physics/en

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