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2025 Vol.13, Issue 1 Preview Page
Enhancing Performance in 1.8 eV Wide Bandgap Perovskite Solar Cells via Interface Design between Hole Transport Layer and Perovskite

정공 수송층과 페로브스카이트 계면 설계를 통한 1.8 eV 넓은 밴드갭 페로브스카이트 태양전지 성능 향상

Jung Jun Kim1
,
Joo Woong Yoon1
,
Jae Ryoung Lee1
,
Seok Beom Kang1
,
Ayoung Lee1
,
Sang Jun Park1
,
Dong Hoe Kim1*
김 정준1
,
윤 주웅1
,
이 재룡1
,
강 석범1
,
이 아영1
,
박 상준1
,
김 동회1*
1Department of Material science and engineering, Korea University, Seoul, 02841, Korea
1신소재공학부, 고려대학교, 서울특별시, 02841
*Corresponding Author
31 March 2025. pp. 7-15
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Abstract

Wide bandgap (1.8 eV) perovskite solar cells are essential for realizing high-efficiency perovskite-perovskite tandem solar cells. However, a key performance bottleneck for these wide bandgap perovskite solar cells is the mismatch at the interface between the hole transport layer (HTL) and perovskite, which causes non-radiative recombination and energy band misalignment. To achieve high efficiency, it is crucial to ensure effective energy level alignment and low hydrophobicity at the HTL/perovskite interface. To address these challenges, a PTAA/Me-4PACz bilayer HTL structure was employed, enhancing interfacial compatibility and promoting uniform perovskite film formation. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses revealed that this bilayer structure induces large grain growth and improves crystallinity in the perovskite film, thereby reducing non-radiative recombination. Devices with this bilayer HTL achieved an impressive open-circuit voltage (VOC) of 1.26 V and a power conversion efficiency (PCE) of 17.62%, while also showing reduced hysteresis compared to single-layer HTLs. These findings demonstrate that the PTAA/Me-4PACz bilayer is an effective strategy for advancing wide bandgap perovskite solar cell technology.

Keywords
Perovskite solar cell
Wide bandgap perovskite
Hole transport layer
Surface modification
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Information
  • Publisher :Korea Photovoltaic Society
  • Publisher(Ko) :한국태양광발전학회
  • Journal Title :Current Photovoltaic Research
  • Volume : 13
  • No :1
  • Pages :7-15
  • Received Date : 2024-12-06
  • Revised Date : 2025-01-24
  • Accepted Date : 2025-02-05
  • DOI :https://doi.org/10.21218/CPR.2025.13.1.007
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