Highly Efficient Inverted Polymer Solar Cells Using an Indium Gallium Zinc Oxide Interfacial Layer. Issue 3 (15th January 2021)

• Record Type: Journal Article
• Authors: Kim, Jun Young; Biswas, Swarup; Lee, Yongju; Lee, Hyeong Won; Jeon, Jae Min; Kim, Hyeok
• Is Part Of: Solar RRL. Volume 5:Issue 3(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-01-15
• Subjects: electron transport layer -- indium- and gallium-doped zinc oxide -- polymer solar cells; Solar energy -- Periodicals; Photovoltaic power generation -- Periodicals; Solar energy -- Research -- Periodicals; Photovoltaic power generation -- Research -- Periodicals; Periodicals; 333.7923
• DOI: 10.1002/solr.202000673
• Languages: English
• ISSNs: 2367-198X

Abstract

Abstract : Organic polymer semiconductor‐based polymer solar cells (PSCs) are drawing tremendous research interest for their superior electrical, structural, optical, mechanical, and chemical properties. During the last two decades, immense efforts have been made toward the development of PSCs. Generally, poly(3, 4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is used as hole transport layer (HTL) of PSCs to improve hole extraction efficiency, but highly acidic PEDOT:PSS reduces device lifetime by destroying indium tin oxide (ITO) electrodes and active layers. To avoid this, some have attempted to develop inverted structured PSCs with different electron transport layers (ETLs); however, the power conversion efficiency (PCE) of these devices is limited owing to low electron mobility of their ETLs. Therefore, an attempt is made to improve the PCE of an inverted‐structured PSC by using indium gallium zinc oxide (IGZO) with optimized amount of indium (In), gallium (Ga), and zinc (Zn). Inverted PSCs with ZnO or IGZO (having various molar ratios of In, Ga, and Zn) as ETL with the structure ITO/ETL/PTB7:PC71 BM/MoO3 /Al are constructed. The PCE of the inverted PSC can be increased from 6.22% to 8.72% by using IGZO with an optimized weight ratio of In, Ga, and Zn as an ETL. Abstract : The effect of the zinc concentration on the performance of solution‐processed indium gallium zinc oxide (IGZO), as an electron transport layer for an inverted polymer solar cell based on PTB7:PC71BM, is investigated. The performances of the devices have been optimized by tuning the concentrations. The IGZO films significantly enhance the power conversion efficiency of the device from 6.22% to 8.72%.