Energy-level engineering of the electron transporting layer for improving open-circuit voltage in dye and perovskite-based solar cells

Seong Sik Shin, Jae Ho Suk, Bong Joo Kang, Wenping Yin, Seon Joo Lee, Jun Hong Noh, Tae Kyu Ahn, Fabian Rotermund, In Sun Cho, Sang Il Seok

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Next-generation solar cells, such as dye-sensitized solar cells (DSSCs) and perovskite solar cells (PSCs), are fabricated in a configuration where light absorbers are located between the electron transporting layer (ETL) and the hole transporting layer (HTM). Although the most efficient DSSCs and PSCs have been fabricated using TiO2 as the ETL, TiO2 exhibits inherently low electron mobility with difficulty controlling the energy levels (i.e., conduction and valence bands) as it possesses a single phase of two components. Here, we report the synthesis of Sr-substituted BaSnO3 (BSSO) by a low-temperature solution process as a new alternative to TiO2 for both PSCs and DSSCs. The energy-level tailoring by Sr incorporation into BaSnO3 minimizes the open-circuit voltage (VOC) loss at the interfaces of ETL/perovskite and ETL/electrolyte in the PSCs and DSSCs, thereby leading to an improved VOC from 0.65 to 0.72 V in DSSC and 1.07 to 1.13 V in PSCs. Additionally, the BSSO ETL-based PSC shows improved photostability compared to the TiO2 analog. Our results show that energy-level tuned BSSO can be applied as a universal ETL for improving efficiency in both PSCs and DSSCs.

Original languageEnglish
Pages (from-to)958-964
Number of pages7
JournalEnergy and Environmental Science
Volume12
Issue number3
DOIs
Publication statusPublished - 2019 Mar 1

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perovskite
Open circuit voltage
Perovskite
Electron energy levels
dye
Solar cells
Coloring Agents
Dyes
engineering
electron
Electrons
energy
Volatile organic compounds
Electron mobility
Valence bands
Perovskite solar cells
solar cell
Conduction bands
Electrolytes
volatile organic compound

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

Cite this

Energy-level engineering of the electron transporting layer for improving open-circuit voltage in dye and perovskite-based solar cells. / Shin, Seong Sik; Suk, Jae Ho; Kang, Bong Joo; Yin, Wenping; Lee, Seon Joo; Noh, Jun Hong; Ahn, Tae Kyu; Rotermund, Fabian; Cho, In Sun; Seok, Sang Il.

In: Energy and Environmental Science, Vol. 12, No. 3, 01.03.2019, p. 958-964.

Research output: Contribution to journalArticle

Shin, Seong Sik ; Suk, Jae Ho ; Kang, Bong Joo ; Yin, Wenping ; Lee, Seon Joo ; Noh, Jun Hong ; Ahn, Tae Kyu ; Rotermund, Fabian ; Cho, In Sun ; Seok, Sang Il. / Energy-level engineering of the electron transporting layer for improving open-circuit voltage in dye and perovskite-based solar cells. In: Energy and Environmental Science. 2019 ; Vol. 12, No. 3. pp. 958-964.
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