Bulk heterojunction perovskite solar cells incorporated with solution-processed TiOX nanoparticles as the electron acceptors

In this study, we report bulk heterojunction perovskite solar cells, where perovskite materials CH3NH3PbI3 is blended with solution-processed n-type TiOx nanoparticles as the photoactive layer. Studies indicate that one-step solution-processed CH3NH3PbI3:TiOx bulk-heterojunction thin film possesses enhanced and balanced charge carrier mobilities, superior film morphology with enlarged crystal sizes, and suppressed trap-induced charge recombination. Thus, bulk heterojunction perovskite solar cells by CH3NH3PbI3 mixed with 5 wt% of TiOX, which is processed by one-step method rather than typical two-step method, show a short-circuit current density of 20.93 mA/cm2, an open-circuit voltage of 0.90 V, a fill factor of 80% and with a corresponding power conversion efficiency of 14.91%, which is more than 30% enhancement as compared with that of perovskite solar cells with a planar heterojunction device structure. Moreover, bulk heterojunction perovskite solar cells possess enhanced device stability. All these results demonstrate that perovskite solar cells with a bulk heterojunction device structure are one of apparent approaches to boost device performance.Graphical abstractIn this study, CH3NH3PbI3 is blended with solution-processed n-type TiOx nanoparticle as the photoactive layer to balance charge carrier transporting properties for addressing the intrinsic electronic properties of perovskite materials. We found that the CH3NH3PbI3:TiOX bulk heterojunction thin film posse...
Source: Chinese Chemical Letters - Category: Chemistry Source Type: research