【公開日：2024.07.25】【最終更新日：2024.06.22】
課題データ / Project Data
課題番号 / Project Issue Number
23NU0033
利用課題名 / Title
ペロブスカイト太陽電池セルの断面観察
利用した実施機関 / Support Institute
名古屋大学 / Nagoya Univ.
機関外・機関内の利用 / External or Internal Use
内部利用（ARIM事業参画者以外）/Internal Use (by non ARIM members)
技術領域 / Technology Area
【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-
【重要技術領域 / Important Technology Area】（主 / Main）革新的なエネルギー変換を可能とするマテリアル/Materials enabling innovative energy conversion（副 / Sub）-
キーワード / Keywords
SWCNT, エネルギーデバイス、燃料電池、太陽電池,燃料電池/ Fuel cell,太陽電池/ Solar cell,電子顕微鏡/ Electronic microscope
利用者と利用形態 / User and Support Type
利用者名（課題申請者）/ User Name (Project Applicant)
松尾 豊
所属名 / Affiliation
名古屋大学工学研究科
共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes
ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes
樋口公孝
利用形態 / Support Type
（主 / Main）技術代行/Technology Substitution（副 / Sub）-
利用した主な設備 / Equipment Used in This Project
NU-103：高分解能透過電子顕微鏡システム
NU-105：バイオ/無機材料用高速FIB-SEMシステム
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
Single-walled carbon nanotubes (SWCNTs) are a promising substitute for metal electrodes in high-performance perovskite solar cells (PSCs) due to their mass producibility, mechanical flexibility, and availability. Nevertheless, enhancing SWCNTs' electrical conductivity remains a critical challenge. Doping, as a solution, significantly increases carrier density, leading to improved energy level alignment and interface morphology is one of the most important strategies. This study introduces a novel p-dopant, heptamethine cyanine (HMC) dye, confirming its effective and stable doping properties. Subsequently, dye doped SWCNTs serve as electrodes in PSCs without a traditional hole transport layer, aiming to boost the power conversion efficiency (PCE) of hole transport layer-free perovskite solar cells.
実験 / Experimental
We used four new heptamethine cyanine dyes (GNW-5) as dopants to dope SWCNTs. The highest occupied molecular orbital (HOMO) was measured using the atmospheric photoelectron yield spectrometer, and the sheet resistance (Rsh) was measured using the four-point probe method. Then four different dye-doped SWCNTs were used as electrodes in the structure of ITO/SnO2/FACSPbI3/SWCNT to fabricate PSCs without hole transport layers and measure the current and voltage characteristics. We measured the cross-sectional images of perovskite solar cell devices with and without dopant of heptamethine cyanine dyes (GNW-5). Samples made a FIB-SEM (NX-5000 : NU-105) , and observed the TEM (JEM-2100F/HK : NU103).
結果と考察 / Results and Discussion
We found that there was no change in the thickness of the SWNCT doped with GNW-5 and the original SWCNT (Figure 1). Observing the cross-section TEM image of the device using doped SWCNT (Figure 2(a)), there was no change between the SWCNT and the MAI passivation layer. It was found that the GNW-5 layer was generated. We can speculate that GNW-5 is attached to the surface of SWNCT through chemical adsorption which means covalent bond (Figure 2(b)). And we observed that the thickness of SnO2 is 10 nm, the thickness of the perovskite layer is 500 nm, and the thickness of the MAI passivation layer is 40 nm. This study achieved very high efficiency in SWCNTs transparent electrode PSCs devices using mass-produced SWCNTs films. This is the first step towards large-scale and mass production of SWCNTs transparent electrode PCSs in the future. In addition, organic dye small molecules that are simple to mass-produce and have good stability are used as p-type dopants to dope the SWCNT film. Their effects and mechanisms were studied, and a lot of knowledge was gained. These data provide a new idea for the processing of SWCNT electrodes. It is of great significance for further improving the power generation efficiency of SWCNTs transparent electrode PCSs in the future.
図・表・数式 / Figures, Tables and Equations
Fig.
1 TEM results of SWCNT before and after doping.
Figure 2 a) Cross-section TEM image of Perovskite solar cell, b) Schematic diagram of doping structure.
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
FIB-SEMのサンプル加工・観察は樋口技術職員の支援を受けました。
成果発表・成果利用 / Publication and Patents
論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)
口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.
特許 / Patents
特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件