Flexible semitransparent perovskite solar cells (PVSCs) hold promising applications on buildings and unmanned vehicles with irregular surfaces. Efficient wide-bandgap PVSCs are a determining factor for building perovskite-based tandem cells, in which energy level alignment plays significant roles in reducing nonradiative recombination loss at interfaces. Here, we report on the fabrication of efficient flexible semitransparent wide-bandgap PVSCs with gradient energy level alignments at both electron- and hole-selective contacts. We design a triple-electron-selective contact as electron transport layers with gradient Fermi level alignment with the conduction band of wide-bandgap perovskite, which consists of trans-1,2-Diaminocyclohexane-N,N,N′,N′-tetraacetic (CyDTA), tin dioxide (SnO₂), and CyDTA-complexed SnO₂. Moreover, an ultrathin gold layer embedded between 2,2′,7,7′-tetrakis(N,N-bis(p-methoxy-phenyl)amino)-9,9′-spirobifluorene (spiro-OMeTAD) hole transport layer and molybdenum oxide protection layer facilitates effective hole transport to the anode. We conduct comprehensive and solid simulation at both charge-selective contacts to reveal the working mechanisms. The champion flexible semitransparent 1.75 eV wide-bandgap PVSC achieves an efficiency of 15.02% with excellent light transparency of around 70% beyond the wavelength of 700 nm, enabling all-flexible perovskite/Cu(In,Ga)Se₂ tandem devices with efficiencies beyond 21%.

柔性半透明钙钛矿太阳能电池（PVSC）在建筑物和不规则表面的无人驾驶汽车上具有广阔的应用前景。高效的宽带隙PVSC是构建基于钙钛矿的串联电池的决定因素，其中能级排列在减少界面处的非辐射重组损失中起着重要作用。在这里，我们报告在电子和空穴选择性接触处具有梯度能级排列的高效柔性半透明宽带隙PVSC的制造。我们设计了一种三电子选择性接触作为电子输运层，其梯度费米能级与宽带隙钙钛矿的导带组成，该带由反式1,2-二氨基环己烷-N，N，N'，N'-四乙酸组成（CyDTA），二氧化锡（SnO ₂）和CyDTA复合的SnO₂。此外，在2,2'，7,7'-四（N，N-双（对甲氧基苯基）氨基）-9,9'-螺双芴（spiro-OMeTAD）空穴传输层与氧化钼保护层有助于将空穴有效地传输到阳极。我们在两个电荷选择触点上进行了全面而可靠的仿真，以揭示其工作机制。冠军般的柔性半透明1.75 eV宽带隙PVSC达到15.02％的效率，在700 nm的波长范围之外具有出色的透光率，约为70％，从而使全柔性钙钛矿/ Cu（In，Ga）Se ₂串联器件的效率超过21％。