Skip to Main Content
 

Global Search Box

 
 
 

ETD Abstract Container

Abstract Header

PREPARATION AND PROPERTY STUDIES OF ORGANIC-INORGANIC HYBRID SEMICONDUCTOR MATERIALS FOR SOLAR CELL APPLICATIONS

Guo, Xin
http://orcid.org/0000-0002-9084-3196
http://rave.ohiolink.edu/etdc/view?acc_num=case1458736601

Abstract Details

2016, Doctor of Philosophy, Case Western Reserve University, Materials Science and Engineering.
The organic–inorganic hybrid semiconductor materials with perovskite structure have attracted great attentions due to their superb photovoltaic characteristics. These organic–inorganic hybrid semiconductors can be fabricated from relatively inexpensive materials by a simple solution process with low annealing temperatures. However, the materials still suffer from problems such as a lack of long-term stability due to an exposure to moisture and oxygen in air and sunlight induced photodegradation. This thesis will concentrate on the preparation of hybrid perovskite under different synthesis conditions, the formation of intermediate perovskite complex during the solution processing, degradation and recovery of perovskite, and the enhanced stability of perovskite by passivation layers. The perovskite films were prepared using single step solution deposition at different annealing temperatures and annealing times. The prepared films show a typical orientation of tetragonal perovskite phase and a gradual transition at room temperature from the yellow intermediate phase to the black perovskite phase. The chemical composition and crystal struture of intermediate phase were investigated in detail. FTIR, UV-vis and NMR spectra revealed the occurance of DMF complexes. In addition, the recovery of aged perovskites was shown to be viable. A batch of prepared films using one-step drop casting were degraded for 14 days under controlled humidity of 60 ±5%. Through X-ray, UV, electron beam irradiation, exposure to lower humidity or thermal annealing, the curing of degraded perovskite was possible. We also presented a novel method for preparing perovskite films using a perovskite paste, prepared by dispersing an equimolar mix of PbI2 and MAI powders into terpineol with stirring. The prepared films were then placed at different humidity levels RH30%, RH50%, RH70% to test the moisture stability. The crystal structure, phases and morphology were investigated with XRD and SEM/EDX. All three samples exhibit a good stability at long time exposure to moisture for 70 days. The enhanced moisture stability might result from passivated surface of perovskite film by terpineol which has a hydrophobic moiety. Time-resolved photoluminescence decay measurements showed the passivation of surface defect states by the formation of either PbI2 or hydrated compound leads to prolonged charge carrier recombination times.
Clemens Burda, Prof. (Advisor)
Pirouz Pirouz, Prof. (Committee Chair)
Chung-Chiun Liu, Prof. (Committee Member)
Mark DeGuire, Prof. (Committee Member)
200 p.
Chemistry; Energy; Materials Science
Preparation; Stability; Organic-Inorganic Hybrid Perovskite

Recommended Citations

Citations

  • Guo, X. (2016). PREPARATION AND PROPERTY STUDIES OF ORGANIC-INORGANIC HYBRID SEMICONDUCTOR MATERIALS FOR SOLAR CELL APPLICATIONS [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1458736601

    APA Style (7th edition)

  • Guo, Xin. PREPARATION AND PROPERTY STUDIES OF ORGANIC-INORGANIC HYBRID SEMICONDUCTOR MATERIALS FOR SOLAR CELL APPLICATIONS. 2016. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1458736601.

    MLA Style (8th edition)

  • Guo, Xin. "PREPARATION AND PROPERTY STUDIES OF ORGANIC-INORGANIC HYBRID SEMICONDUCTOR MATERIALS FOR SOLAR CELL APPLICATIONS." Doctoral dissertation, Case Western Reserve University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1458736601

    Chicago Manual of Style (17th edition)

case1458736601
1,883
© 2016, some rights reserved.Creative Commons License PREPARATION AND PROPERTY STUDIES OF ORGANIC-INORGANIC HYBRID SEMICONDUCTOR MATERIALS FOR SOLAR CELL APPLICATIONS by Xin Guo is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.