Perovskite-sensitized solar cells-based Ga–TiO2 nanodiatom-like photoanode: the improvement of performance by perovskite crystallinity refinement

Ali Umar Akrajas, Altaf Yahya Ahmed Al-She’irey, Mohd Yusri Abd Rahman, Muhamad Mat Salleh, Munetaka Oyama

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The structure and crystallinity of the photoactive materials in solar cell determines the exciton formation, carrier’s recombination, life-time and transportation in the devices. Here, we report that enhanced charge transportation, internal quantum efficiency and the carrier life-time can be achieved by modifying the structure, morphology of the organic perovskite thin film, enabling the improvement of the solar cell performance. The thin film structure modification was achieved via a thermal annealing in vacuum. In typical procedure, the power conversion efficiency of the PSC device can be upgraded from 0.5 to 2.9%, which is approximately 6 times increment, when the surface structure disorders are limited in the organic perovskite thin film. By optimizing the organic perovskite loading on the Ga–TiO2 diatom-like nanostructures photoanode and combining with a fine control of organic perovskite thin film structure, power conversion efficiency as high as 6.58% can be generated from the device. Electrochemical impedance spectroscopy and current–voltage analysis in the dark indicated that this process has effectively augmented the carrier life-time and limited the carrier recombination, enhancing the overall performance of the solar cell device. The preparation process and mechanism of the device performance improvement will be discussed.

Original languageEnglish
Article number366
JournalApplied Physics A: Materials Science and Processing
Volume124
Issue number5
DOIs
Publication statusPublished - 1 May 2018

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Perovskite
Solar cells
Thin films
Carrier lifetime
Conversion efficiency
Transportation charges
Quantum efficiency
Electrochemical impedance spectroscopy
Excitons
Surface structure
Nanostructures
Vacuum
Annealing
perovskite

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

Cite this

Perovskite-sensitized solar cells-based Ga–TiO2 nanodiatom-like photoanode : the improvement of performance by perovskite crystallinity refinement. / Akrajas, Ali Umar; Al-She’irey, Altaf Yahya Ahmed; Abd Rahman, Mohd Yusri; Mat Salleh, Muhamad; Oyama, Munetaka.

In: Applied Physics A: Materials Science and Processing, Vol. 124, No. 5, 366, 01.05.2018.

Research output: Contribution to journalArticle

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