摘要： Semi-transparent organic solar cells (ST-OSCs) have been regarded as a promising candidate for building integrated photovoltaics (BIPV). In general, most of the ST-OSCs are based on bulk heterojunction (BHJ) structure, in which, the morphology of BHJ film must be delicately optimized. In this work, we introduce sequentially deposited bilayer structure into ST-OSCs by using PTB7-Th:IEICO-4F combination. The adoption of bilayer structure not only simplifies the device optimization, it is also found that, as donor and acceptor are separately deposited, the power conversion efficiency (PCE) of bilayer ST-OSCs can be improved by simply increasing the thickness of IEICO-4F, which has strong near infrared absorption but weak visible light absorption, without significantly affecting the average visible light transmittance (AVT) of device. However, in BHJ structure, the increase in BHJ film thickness unavoidably enhances the donor absorption in visible light region, leading to a tradeoff between PCE and AVT in BHJ structure ST-OSCs. Eventually, the bilayer structure device exhibits better overall performance than BHJ structure device, e.g. PCE of 8.5% for bilayer structure vs PCE of 8.1% for BHJ structure with AVT around 21%. Our findings indicate that the sequentially deposited bilayer structure, aside from its easy processing characteristic, also has great potential for preparing high performance ST-OSCs.