Abstract
In this thesis, I focus on the optical and device engineering of vacuum deposited organic and perovskite solar cells. In the first part of this thesis, I reviewed the development of vacuum deposited organic and perovskite solar cells, followed by the theory and working mechanisms of these two different solar cells. In the second part, I systematic studied the properties of vacuum deposited small molecule organic solar cells (SMOSCs), such as optical constants, molecular orientation, carrier transport and the correlation of the morphology, molecular stacking, dynamic and device performance. Chapter 2 described the uniaxial optical anisotropy with the optical axis perpendicular to the surface normal in CuPc neat film and the decreasing degree of anisotropy in CuPc:C60 mixed layer. In chapter 3, I revealed that DBP:C60 (1:2) PMHJ devices exhibited a superior performance due to their promising advantages including preferable domain sizes, partially interconnected acceptor grains and close packing donor molecules with horizontal orientation. In chapter 4, SMOSCs utilizing novel D-A and A-D-A type molecules as donors were fabricated and characterized and they exhibited promising power conversion efficiencies (PCEs) of 4.2% and 3.8%, respectively. In the third part, I demonstrated a novel vacuum sequential deposited method to fabricate the high quality perovskite thin films, and further optimized the device structures of perovskite solar cells by optical simulation. The practical perovskite solar cells delivered a remarkable performance of PCE as high as 15.4%. Our calculations also suggested that PCEs of up to 20% and 29% are feasible without any antireflection and light scattering structures in single and perovskite/CIGS tandem cells given a proper device structure design.