Probing individal subcells of fully printed and coated polymer tandem solar cells using multichromatic opto-electronic characterization methods

Thue Trofod Larsen-Olsen, Thomas Rieks Andersen, Henrik Friis Dam, Mikkel Jørgensen, Frederik C Krebs

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In this study, a method to opto-electronically probe the individual junctions and carrier transport across interfaces in fully printed and coated tandem polymer solar cells is described, enabling the identification of efficiency limiting printing/coating defects. The methods used are light beam induced current (LBIC) mapping, External quantum efficiency (EQE) measurements, and monochromatic current-voltage (I-V) characterization. Using these methods, inherent limitations to the accuracy of EQE and LBIC measurements on non-ideal tandem solar cells are identified and described through the use of a small-signal electrical model. The model is able to predict the EQE spectrum of the non-ideal polymer tandem solar cell, using extracted values of shunt- and series resistance of the individual junction of the tandem cell. This finally enables LBIC mapping of the individual junctions of the tandem polymer solar cells, using a combination of light and voltage-biasing.
Original languageEnglish
JournalSolar Energy Materials and Solar Cells
Volume137
Pages (from-to)154-163
ISSN0927-0248
DOIs
Publication statusPublished - 2015

Keywords

  • Characterization
  • EQE
  • LBIC
  • Organic photovoltaics
  • Roll-to-roll
  • Tandem solar cells
  • Electric resistance
  • Induced currents
  • Mapping
  • Plastic coatings
  • Polymers
  • Solar power generation
  • Roll to Roll
  • Solar cells

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