In this work, we have systematically investigated the post-thermal annealing-induced enhancement in photovoltaic performance of a 2,4-bis[4-(N, N-diisobutylamino)-2,6-dihydroxyphenyl] squaraine (DIBSQ)/C₆₀ planar heterojunction (PHJ) organic solar cells (OSCs). An increased power conversion efficiency (PCE) of 3.28% has been realized from a DIBSQ/C₆₀ device with thermal annealing at 100 °C for 4 min, which is about 33% enhancement compared with that of the as-cast device. The improvement of the device performance may be mainly ascribed to the crystallinity of the DIBSQ film with post-thermal annealing, which will change the DIBSQ donor and C₆₀ acceptor interface from ^PHJ to hybrid planar-mixed heterojunction. This new donor-acceptor heterojunction structure will significantly improve the charge separation and charge collection efficiency, as well as the open circuit voltage (V_oc) of the device, leading to an enhanced PCE. This work provides an effective strategy to improve the photovoltaic performance of SQ-based OSCs.

在这项工作中，我们系统地研究了2,4-双[4-（N，N-二异丁基氨基）-2,6-二羟基苯基]方酸（DIBSQ）/ C ₆₀的热退火后诱导的光伏性能增强平面异质结（PHJ）有机太阳能电池（OSC）。通过在100°C下进行4分钟热退火的DIBSQ / C ₆₀器件，已经实现了3.28％的功率转换效率（PCE）提高，与铸态器件相比，提高了约33％。器件性能的提高可能主要归因于采用后热退火的DIBSQ膜的结晶度，这将改变DIBSQ供体和C ₆₀从^ PHJ到杂化平面混合异质结的受体界面。这种新的施主-受体异质结结构将显着改善电荷分离和电荷收集效率，以及器件的开路电压（V _oc），从而增强PCE。这项工作为提高基于SQ的OSC的光伏性能提供了有效的策略。