The tuning of vertical morphology is critical and challenging for organic solar cells (OSCs). In this work, a high open-circuit voltage (VOC) binary D18-Cl/L8-BO system is attained while maintaining the high short-circuit current (JSC) and fill factor (FF) by employing 1,4-diiodobenzene (DIB), a volatile solid additive. It is suggested that DIB can act as a linker between donor or/and acceptor molecules, which significantly modifies the active layer morphology.… Read More
The record power conversion efficiency of organic photovoltaic (OPV) has been boosting rapidly with the development of novel materials and morphology optimization of bulk heterojunction (BHJ) active layer. However, the quantitative determination of out-of-plane nanoscale phase structure of BHJ is still under great challenge. The thin film device structure breaks the symmetry into the in-plane (IP) direction and out-of-plane (OOP) direction with respect to the substrate, leading to an intrinsic anisotropy in the bulk morphology.… Read More
Cesium lead based all-inorganic perovskite solar cells (PSCs) are promising candidates for tandem solar cells owing to their favorable thermal stability and suitable bandgap. However, to exploit the advantage to the full, there is still huge room to reduce energy loss and enhance the VOC. In this work, low-temperature processed ZnO was developed as an ETL alternative.… Read More
Yuang Fu joins our group as a graduate student majoring in Physics. And he is awarded Hong Kong PhD Fellowship, Congratulations!
Metal halide perovskites are of fundamental interest in the research of modern thin-film optoelectronic devices, owing to their widely tunable optoelectronic properties and solution processibility. To obtain high-quality perovskite films and ultimately high-performance perovskite devices, it is crucial to understand the film formation mechanisms, which, however, remains a grand challenge, due to the complexity of perovskite composition, dimensionality, and processing conditions.… Read More
