Rasool Shafket, Khan Nasir, Jahankhan Muhammad, Kim Da Hun, Ho Thuy Thi, Do Ly Thi, Song Chang Eun, Lee Hang Ken, Lee Sang Kyu, Lee Jong-Cheol, So Won-Wook, Moon Sang-Jin, Shin Won Suk
Advanced Materials and Chemical Engineering , University of Science and Technology (UST) , 217 Gajeongro , Yuseong, Daejeon 34113 , Republic of Korea.
KU-KRICT Collaborative Research Center & Division of Display and Semiconductor Physics & Department of Advanced Materials Chemistry , Korea University , 2511 Sejong-ro , Sejong 30019 , Republic of Korea.
ACS Appl Mater Interfaces. 2019 May 8;11(18):16785-16794. doi: 10.1021/acsami.9b03298. Epub 2019 Apr 30.
Solution-processed organic solar cells (OSCs) and hybrid perovskite solar cells (PvSCs) generally require appropriate transparent electrode with a low work function, which improves the electron extraction, increases the built-in potential, and suppresses charge recombinations. Hence, interfacial modifiers between the cathode and the photoactive layer play a significant role in OSCs and PvSCs, as they provide suitable energy-level alignment, leading to desirable charge carrier selectivity and suppressing charge carrier recombinations at the interfaces. Here, we present a comprehensive study of the energy-level mapping between a transparent electrode and photoactive layers to enhance the electron-transport ability by introducing amine-based interfacial modifiers (ABIMs). Among the ABIMs, polyethylenimine ethoxylated (PEIE) incorporating inverted OSCs shows enhanced power conversion efficiencies (PCEs) from 0.32 to 9.83% due to large interfacial dipole moments, leading to a well-aligned energy level between the cathode and the photoactive layer. Furthermore, we explore the versatility of the PEIE ABIM by employing different photoactive layers with fullerene derivatives, a nonfullerene acceptor, and a perovskite layer. Promisingly, inverted nonfullerene OSCs and planar n-i-p PvSCs with PEIE ABIM show outstanding PCEs of 11.88 and 17.15%, respectively.
溶液处理的有机太阳能电池（OSC）和混合钙钛矿太阳能电池（PvSC）通常需要具有低功函数的合适透明电极，这可以改善电子提取、增加内建电势并抑制电荷复合。因此，阴极与光活性层之间的界面改性剂在OSC和PvSC中起着重要作用，因为它们提供合适的能级排列，从而实现理想的电荷载流子选择性并抑制界面处的电荷载流子复合。在此，我们通过引入基于胺的界面改性剂（ABIM）对透明电极与光活性层之间的能级映射进行了全面研究，以提高电子传输能力。在ABIM中，含有倒置OSC的聚乙撑亚胺乙氧基化物（PEIE）由于具有大的界面偶极矩，其功率转换效率（PCE）从0.32%提高到9.83%，从而在阴极与光活性层之间实现了良好的能级排列。此外，我们通过使用具有富勒烯衍生物、非富勒烯受体和钙钛矿层的不同光活性层来探索PEIE ABIM的通用性。令人鼓舞的是，具有PEIE ABIM的倒置非富勒烯OSC和平面n-i-p PvSC分别显示出11.88%和17.15%的出色PCE。
