23613-36-7Relevant academic research and scientific papers
Boosting the photovoltaic thermal stability of fullerene bulk heterojunction solar cells through charge transfer interactions
Yi Ho, Carr Hoi,Cao, Huanyang,Lu, Yong,Lau, Tsz-Ki,Cheung, Sin Hang,Li, Ho-Wa,Yin, Hang,Chiu, Ka Lok,Ma, Lik-Kuen,Cheng, Yuanhang,Tsang, Sai-Wing,Lu, Xinhui,So, Shu Kong,Ong, Beng S.
, p. 23662 - 23670 (2017)
Fullerene-based bulk heterojunction organic solar cells (BHJ-OSCs) represent one of the current state-of-the-art organic solar cells. Nonetheless, most of these devices still suffer from adverse performance degradation due to thermally induced morphology changes of active layers. We herein demonstrate that the photovoltaic performance stability of BHJ-OSCs can be profoundly enhanced with an appositely functionalized 9-fluorenylidene malononitrile. The latter, through charge transfer (CT) interactions with a donor polymer, enables the formation of a frozen 3-dimensional mesh-like donor polymer matrix, which effectively restrains free movement of embedded fullerene molecules and suppresses their otherwise uncontrolled aggregation. 9-Fluorenylidene malononitrile derivatives with multiple CT interaction sites are particularly effective as preservation of a power conversion efficiency of over 90% under severe thermal stress has been accomplished. The generality of this novel strategy has been affirmed with several common donor polymers, manifesting it to be hitherto the most efficient approach to stabilized fullerene-based BHJ-OSCs.
Nitroaromatics as n-type organic semiconductors for field effect transistors
Ghamari, Pegah,Hamzehpoor, Ehsan,Niazi, Muhammad Rizwan,Perepichka, Dmitrii F.,Perepichka, Igor F.
supporting information, p. 6432 - 6435 (2020/06/21)
The nitro group (NO2) is one of the most common electron-withdrawing groups but it has rarely been used in the design of organic semiconductors (OSCs). Herein, we report the n-type semiconducting behavior of simple fluorenone derivatives functionalized with NO2and CN groups. While the electron mobilities measured in the thin film field-effect transistors are modest (10?6-10?4cm2V?1s?1), the nitrofluorenone OSCs offer excellent air-stability and remarkable tunability of energy levelsviafacile modification of the substitution pattern. We study the effect of substituents on the electrochemical properties, molecular and crystal structure, and the charge transport properties of nitrofluorenones to revitalize the underestimated potential of NO2functionalization in organic electronics.
