skip to main content

SciTech ConnectSciTech Connect

Title: Organic solvent vapor sensitive methylammonium lead trihalide film formation for efficient hybrid perovskite solar cells

In this study, the anisotropic electronic properties of the perovskite crystals originating from their non-cubic crystal structures can potentially give rise to the grain orientation correlated photovoltaic device performance. Here we report that an organic solvent vapor atmosphere introduced during the spin-coating and formation of perovskite films changes the orientation and size of perovskite grains. It was found that slightly larger but much more oriented methylammonium lead trihalide (CH3NH3PbI3) grains could be obtained under 1,2-dichlorobenzene (DCB) and dimethyl sulfoxide (DMSO) vapor atmospheres. The devices with more oriented grains outperformed regular devices with more random grains by a 50 mV larger open circuit voltage as well as a slightly increased fill factor. The device efficiency enhancement can be attributed to the longer charge recombination lifetime resulting from the reduced trap density and oriented grains. This result is important in providing guidelines for comparing the results from various groups because organic solvent vapors are generally present in a sealed glovebox for perovskite solar cell fabrication.
 [1] ;  [2] ;  [2] ;  [2] ;  [2]
  1. Univ. of Nebraska, Lincoln, NE (United States); Shenzhen Univ., Shenzhen (China)
  2. Univ. of Nebraska, Lincoln, NE (United States)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 3; Journal Issue: 17; Journal ID: ISSN 2050-7488
Royal Society of Chemistry
Research Org:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Org:
Country of Publication:
United States