Titanium oxide nanomaterials as an electron-selective contact in silicon solar cells for photovoltaic devices

Dongkyun Kang, Jongwon Ko, Changhyun Lee, Donghwan Kim, Hyunju Lee, Yoonmook Kang, Hae Seok Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

To obtain high conversion efficiency, various carrier-selective contact structures are being applied to the silicon solar cell, and many related studies are being conducted. We conducted research on TiO2 to create an electron-selective contact structure that does not require a high-temperature process. Titanium metal was deposited using a thermal evaporator, and an additional oxidation process was conducted to form titanium oxide. The chemical compositions and phases of the titanium dioxide layers were analyzed by X-ray diffraction. The passivation effects of each titanium oxide layer were measured using the quasi-steady-state photoconductance. In this study, the layer properties were analyzed when TiO2 had a passivation effect on the silicon surface. The charge and interface defect densities of the layer were analyzed through CV measurements, and the passivation characteristics according to the TiO2 phase change were investigated. As a result, by applying optimized TiO2 layer thickness and annealing temperature conditions through the experiment for passivation to the cell-like structure, which is the structure before metal and electrode formation, an implied open-circuit voltage (iVoc) of 630 mV and an emitter saturation current density (J0) value of 60.4 fA/cm2 were confirmed.

Original languageEnglish
Article number39
JournalDiscover Nano
Volume18
Issue number1
DOIs
Publication statusPublished - 2023

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (No. 2022M3J7A1066428) and supported by “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20204010600470).

Publisher Copyright:
© 2023, The Author(s).

Keywords

  • Electron selective contact
  • Passivation effect
  • Titanium oxide nanomaterials

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics

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