Temperature dependence of hole conductor free formamidinium lead iodide perovskite based solar cells

Sigalit Aharon, Alexander Dymshits, Amit Rotem, Lioz Etgar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

190 Scopus citations

Abstract

Organometal halide perovskite is a promising material in photovoltaic (PV) cells. Within a short time, its performance has increased dramatically to become a real competitor to silicon solar cells. Here we report on the temperature dependence (annealing temperature and the dependence of the photovoltaic parameters on temperature) of formamidinium (FA) lead iodide (FAPbI3), methylammonium (MA) lead iodide (MAPbI3) and their mixture (MAPbI3: FAPbI3) in hole conductor free perovskite solar cells. These three types of perovskites function both as light harvesters and as hole conductors. Surface photovoltage and optical characterization reveal the p-type behavior and the band gap of the different perovskites. We observed that the ratio between the MA and FA cations might change during the annealing process, affecting the band gap and the stability of the layers. The PV parameters at different temperatures show better stability for the pure MAPbI3 and FAPbI3 solar cells compared to their mixture. Using intensity modulated photovoltage/photocurrent spectroscopy, we found that the diffusion length is weakly dependent on the light intensity, while the charge collection efficiency drops with light intensity for the FAPbI3-based cells. However, for MAPbI3 and the mixture, the charge collection efficiency remains constant for a wide range of light intensities.

Original languageAmerican English
Pages (from-to)9171-9178
Number of pages8
JournalJournal of Materials Chemistry A
Volume3
Issue number17
DOIs
StatePublished - 7 May 2015

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2015.

Fingerprint

Dive into the research topics of 'Temperature dependence of hole conductor free formamidinium lead iodide perovskite based solar cells'. Together they form a unique fingerprint.

Cite this