混溶性
材料科学
玻璃化转变
有机太阳能电池
聚合物太阳能电池
活动层
三元运算
化学工程
热稳定性
扩散
聚合物混合物
纳米技术
聚合物
图层(电子)
复合材料
热力学
共聚物
物理
程序设计语言
工程类
薄膜晶体管
计算机科学
作者
Chihyung Lee,Hyunjin Jo,Minwoo Nam,Jang Hee Hong,Gyu‐Hee Kim,Hyun Hwi Lee,Jehan Kim,Rakwoo Chang,Doo‐Hyun Ko
标识
DOI:10.1002/adfm.202308047
摘要
Abstract Extensive research on bulk‐heterojunction (BHJ) optimization has advanced organic photovoltaics (OPVs). However, the need for research addressing the issue of morphological instability and ensuring long‐term durability remains a priority. Herein, a diffusion‐governed morphological modification methodology via a sequential deposition (SD) process comprising ternary components with low miscibility is demonstrated. Sequential coating of a high glass transition temperature ( T g ) material and a host binary blend induces a concentration difference between successively coated layers, allowing for effective blending of immiscible materials during solvent evaporation. The enhanced miscibility of the SD‐processed BHJ layer facilitates molecular interactions between the high T g material and the host materials, thereby increasing the T g of the BHJ blend. The SD‐processed OPVs exhibit superior photovoltaic performance and suppressed glass transition under thermal stress compared to reference OPVs fabricated via a conventional method. After 500 h of thermal aging at 85 °C, the SD‐BHJ OPV retains over 80% of its initial efficiency, whereas the reference device shows a drastic drop to below 80% of its initial efficiency after only 80 h. This study provides a step toward efficient, long‐term stable OPVs by overcoming the limitations of blend miscibility and poor thermal durability of conventional BHJ systems via a SD process.
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