Loading...

Improvement of Perovskite Coating to Increase Operation Efficiency of Photovoltaic Cells

Zarenezhad, Hamaneh | 2020

602 Viewed
  1. Type of Document: Ph.D. Dissertation
  2. Language: English
  3. Document No: 52573 (57)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Askari, Masoud; Halali, Mohammad
  7. Abstract:
  8. In this work, polyvinylidene difluoride (PVDF) as a ferroelectric polymer, polyaniline (PANI) and polypyrrole (PPy) as conductive polymer additives are used to fabricate high performance mesoporous CH3NH3PbI3-xClx mixed-halide perovskite solar cells in a sequential deposition method. Using polymer additives in perovskite precursor solution leads to modification of perovskite layer morphology by changing nucleation and growth of perovskite grains. Besides, conductive polymer additives in perovskite layer help to more charge carrier transfer. Power conversion efficiency has been enhanced from 10.40 % to 16.51% and to 13.21 % in ambient atmosphere in the presence of 1.0 wt. % of PVDF and PPy respectively, assuring continuous and smooth layers with large grain size. The current and voltage are increased from 17.39 mA.cm-2 and 0.95 V to 24.75 mA.cm-2 and 1.01 V with 1.0 wt. % PVDF while they are increased to 19.78 mA.cm-2 and 0.97 V for perovskite solar cell prepared by 1.0 wt. % PPy. Conversely, PAN has negative effect on photovoltaic performance and efficiency decreases to 8.64 % with low current and voltage of 14.14 mA.cm-2 and 0.91 V. External quantum efficiency of 80% is obtained for PSC prepared by 1.0 wt. % PVDF while 70 % and 50 % are gained in presence of PPy and PANI respectively. More compact and uniform perovskite layers prepared by 1.0 wt. % PVDF and 1.0 wt. % PPy could decrease charge recombination rate by 30 % and 22 %, respectively. Light absorption also increases by 35 % in presence of 1.0 wt. % PVDF related to complete perovskite formation and continuous layer. Besides morphological improvements, directing the dipoles under positive poling led to highest power conversion efficiency of 18.60 %
  9. Keywords:
  10. Morphology ; Polymer Additives ; Efficiency ; Ferroelectric ; Perovskite-Based Solar Cell ; Photovoltaic Cell

 Digital Object List

 Bookmark

No TOC