Enhancing efficiency of perovskite solar cell via surface microstructuring: Superior grain growth and light harvesting effect

Herein a new variant of surface microstructuring is introduced in the perovskite solar cell architecture to enhance the CH3NH3PbI3 loading and mean crystallite size. This enhancement leads to enhanced light harvesting, leading to higher current density (Jsc) as well as higher Voc by reducing carrier...

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Published inSolar energy Vol. 112; pp. 12 - 19
Main Authors Tathavadekar, Mukta C., Agarkar, Shruti A., Game, Onkar S., Bansode, Umesh P., Kulkarni, Sneha A., Mhaisalkar, Subodh G., Ogale, Satishchandra B.
Format Journal Article
LanguageEnglish
Published New York Elsevier Ltd 01.02.2015
Pergamon Press Inc
Subjects
Energy efficiency
Grain growth
Light harvesting
Microstructure
Perovskite
Perovskite solar cells
Scattering
Solar energy
Thin films
TiO2 nanobeads
Grain growth
TiO2 nanobeads
Light harvesting
Perovskite solar cells
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Summary:Herein a new variant of surface microstructuring is introduced in the perovskite solar cell architecture to enhance the CH3NH3PbI3 loading and mean crystallite size. This enhancement leads to enhanced light harvesting, leading to higher current density (Jsc) as well as higher Voc by reducing carrier recombination. [Display omitted] •Use of nano assembled TiO2 submicron beads in perovskite solar cell.•Light harvesting effect through enhanced grain growth of perovskite crystallites.•Significant improvement in cell conversion efficiency as compared to conventional mesoporous TiO2. We have introduced a novel approach to enhance the perovskite solar cell efficiency by controlling the grain growth and light harvesting properties of perovskite crystallites. Instead of using a mesoporous TiO2 layer, we have modified the surface microstructuring of the TiO2 film by dispensing nano assembled TiO2 submicron structures (nanobeads, NBs) on TiO2 compact layer. With this new approach solar cell efficiency was improved significantly through an increase in both Jsc and Voc. This high efficiency is attributed to crystallite size of the perovskite phase. These also act as light scattering centers giving higher current density and reduced recombination effects giving higher open circuit voltage.
ISSN:0038-092X
1471-1257
DOI:10.1016/j.solener.2014.11.016