Solution-processed colloidal quantum dots (CQDs) are promising optoelectronic materials; however, CQD solids have, to date, exhibited either excellent transport properties but fusion among CQDs or limited transport when QDs are strongly passivated. Here, we report the growth of monolayer perovskite bridges among quantum dots and show that this enables the union of surface passivation with improved charge transport. We grow the perovskite layer after forming the CQD solid rather than introducing perovskite precursors into the quantum dot solution: the monolayer of perovskite increases interdot coupling and decreases the distance over which carriers must tunnel. As a result, we double the diffusion length relative to reference CQD solids and report solar cells that achieve a stabilized power conversion efficiency (PCE) of 13.8%, a record among Pb chalcogenide CQD solar cells.

溶液处理的胶体量子点（CQD）是很有前途的光电材料。然而，迄今为止，CQD固体要么表现出出色的传输性能，要么在CQD之间融合，或者当QD被强烈钝化时传输受限。在这里，我们报道了量子点之间单层钙钛矿桥的生长，并表明这使表面钝化与改进的电荷传输结合在一起。我们在形成CQD固体之后就生长钙钛矿层，而不是将钙钛矿前体引入量子点溶液：钙钛矿的单层增加了点间耦合并减小了载流子必须隧穿的距离。结果，相对于参考CQD固体，我们将扩散长度加倍，并报告了达到13.8％稳定功率转换效率（PCE）的太阳能电池，