Efficient non-fullerene organic solar cells employing sequentially deposited donor-acceptor layers
Efficient non-fullerene organic solar cells employing sequentially deposited donor-acceptor layers
复制标题
DOI：
10.1039/c8ta06860g
复制
发表时间：
2018-09
影响因子：
--
通讯作者：
Jiangbin Zhang;B. Kan;Andrew J. Pearson;A. Parnell;Joshaniel F. K. Cooper;Xiao-Ke Liu;P. Conaghan-P.-Conagh
中科院分区：
文献类型：
--
作者：
Jiangbin Zhang;B. Kan;Andrew J. Pearson;A. Parnell;Joshaniel F. K. Cooper;Xiao-Ke Liu;P. Conaghan-P.-Conagh
非富勒烯受体（NFA）最近在二元体异质结（BHJ）有机太阳能电池（OSC）中的性能优于富勒烯受体。NFA OSC的进一步发展可能有益于改变或扩展标准BHJ概念的其他新型OSC器件结构。在这里，我们报告这样一个新的处理路线，形成BHJ状形态之间的顺序处理的聚合物供体和NFA与高功率转换效率超过10%。两种器件显示出相似的电荷产生和复合行为，支持形成相似的BHJ有源层。通过电压损耗分析，我们将sq-BHJ器件中的1.30 MeV较小的开路电压与更大量的非辐射复合相关联。我们还确定了基准聚合物PBDB-T的激子扩散长度为10 ± 3 nm。我们的研究结果表明，高效率的OSC设备使用顺序沉积方法，并提供了新的机会，以进一步提高性能的国家的最先进的OSC。
Non-fullerene acceptors (NFAs) have recently outperformed their fullerene counterparts in binary bulk-heterojunction (BHJ) organic solar cells (OSCs). Further development of NFA OSCs may benefit other novel OSC device structures that alter or extend the standard BHJ concept. Here, we report such a new processing route that forms a BHJ-like morphology between sequentially processed polymer donor and NFA with high power conversion efficiencies in excess of 10%. Both devices show similar charge generation and recombination behaviours, supporting formation of similar BHJ active layers. We correlate the ∼30 meV smaller open-circuit voltage in sq-BHJ devices to more substantial non-radiative recombination by voltage loss analysis. We also determine the exciton diffusion length of benchmark polymer PBDB-T to be 10 ± 3 nm. Our results demonstrate high-efficiency OSC devices using sequential deposition method and provide new opportunities to further improve performance of state-of-the-art OSCs.