Increased Efficiency for Perovskite Photovoltaics via Doping the PbI2 Layer

Sally Mabrouk, Ashish Dubey, Wenfeng Zhang, Nirmal Adhikari, Behzad Bahrami, Md Nazmul Hasan, Shangfeng Yang, Qiquan Qiao

Research output: Contribution to journalArticlepeer-review

Abstract

Perovskite solar cells offer tremendous potential for simple and low-cost solution-based fabrication with high power conversion efficiency. This work focused on adding an optimized amount of additive tetra-n-butylammonium triiodide (TBAI3) into the precursor PbI2 layer to improve the performance of perovskite solar cells. UV-vis absorption spectra exhibited an enhancement in the absorbance of perovskite films while AFM images showed smoother MAPbI3 film after adding TBAI3. X-ray diffraction (XRD) measurements indicated that TBAI3 acted as a polar Lewis base, forming an adduct with the Lewis acid Pb2+, increasing PbI2 solubility, and enhancing crystal growth of perovskite. Current density-voltage (J-V) characteristics and transient photocurrent measurements showed that the TBAI3 dopant achieved an increase in short circuit current density (Jsc) and open circuit voltage (Voc) and a decrease in the charge transport time compared to the reference cell without any additive. Perovskite solar cell efficiency was enhanced from 11.18% to 14.85% by adding TBAI3 dopant to the PbI2 precursor. (Chemical Equation Presented).

Original languageEnglish (US)
Pages (from-to)24577-24582
Number of pages6
JournalJournal of Physical Chemistry C
Volume120
Issue number43
DOIs
StatePublished - Nov 3 2016
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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