Type-I alignment in MAPbI3 based solar devices with doped-silicon nanocrystals

Conor Rocks, Vladimir Svrcek, Tamilselvan Velusamy, Manuel Macias-Montero, P Maguire, Davide Mariotti

Research output: Contribution to journalArticle

9 Citations (Scopus)
29 Downloads (Pure)

Abstract

In this work we couple silicon nanocrystals (Si NCs) with strong quantum confinement (< 4 nm diameter) with large grained MAPbI3 films combining the perovskites excellent transport properties with the unique opto-electronic properties of quantum confined Si NCs. The electronic structures of MAPbI3 and Si NCs, ideally aligned to form a type-I heterojunction, demonstrated improved carrier collection through a higher short-circuit current density (~ 20 mA cm−2) measured in photovoltaic test devices. The addition of p- and n-doped Si NCs within the MAPbI3 films also showed unexpected and interesting device performance improvements, where the typical perovskite degradation process in ambient conditions was considerably slowed down and the overall device efficiency was observed to increase under light soaking. We attribute these improvements to the presence of Si NCs, which helped maintain the perovskite film qualities for more than 14 days in open atmosphere.
Original languageEnglish
Pages (from-to)245-255
Number of pages11
JournalNano Energy
Volume50
Early online date18 May 2018
DOIs
Publication statusPublished - Aug 2018

Keywords

  • Perovskite
  • Silicon nanocrystals
  • Quantum dots
  • Solar cells
  • Type-I alignment

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