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Unraveling the impact of hole transport materials on photostability of perovskite films and p-i-n solar cells
摘要： We investigated the impact of a series of hole transport layer materials (HTLs) such as PEDOT:PSS, NiOx, PTAA, and PTA on photostability of thin films and solar cells based on MAPbI3, Cs0.15FA0.85PbI3, Cs0.1MA0.15FA0.75PbI3, Cs0.1MA0.15FA0.75Pb(Br0.15I0.85)3, and Cs0.15FA0.85Pb(Br0.15I0.85)3 complex lead halides. Mixed halide perovskites showed reduced photostability in comparison with similar iodide-only compositions. In particular, we observed light-induced recrystallization of all perovskite films except MAPbI3 with the strongest effects revealed for Br-containing systems. Moreover, halide and β FAPbI3 phase segregations were also observed mostly in mixed-halide systems. Interestingly, coating perovskite films with PCBM layer spectacularly suppressed light-induced growth of crystalline domains as well as segregation of Br-rich and I-rich phases or β FAPbI3. We strongly believe that all three effects are promoted by the light-induced formation of surface defects, which are healed by adjacent PCBM coating. While comparing different hole-transport materials, we found that NiOx and PEDOT:PSS are the least suitable HTLs due to their interfacial (photo)chemical interactions with perovskite absorbers. On the contrary, polyarylamine-type HTLs PTA and PTAA form rather stable interfaces, which makes them the best candidates for durable p-i-n perovskite solar cells. Indeed, multilayered ITO/PTA(A)/MAPbI3/PCBM stacks revealed no aging effects within 1000 h of continuous light soaking and delivered stable and high power conversion efficiencies in solar cells. The obtained results suggest that using polyarylamine-type HTLs and simple single-phase perovskite compositions paves a way for designing stable and efficient perovskite solar cells.
关键词： stable HTL/perovskite interface,interface-induced degradation,light-induced perovskite crystallization,photo-induced degradation,p-i-n perovskite solar cells
更新于2025-09-23 15:21:01
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Graphdiyne: Bridging SnO <sub/>2</sub> and Perovskite in Planar Solar Cells
摘要： The collocation between charge transport layer and photoactive layer is extremely critical in solar energy conversion devices. More recently, it is especially prominent for promising planar perovskite solar cell based on SnO2 electron transfer layer (ETL) due to its unmatched photogenerated electron and hole extraction rates. Thereby, graphdiyne (GDY) with multi-roles has been incorporated to maximize the collocation between SnO2 and perovskite regarding perspectives of electron extraction rate optimization as well as the interface engineering for perovskite growth inducement and interfacial defect passivation, enabling such interfacial function towards both perovskite crystallization process and subsequent photovoltaic service duration. The GDY doped SnO2 layer finally results 4-times improved electron mobility and more facilitated band alignment. Simultaneously, the enhanced hydrophobicity effectively inhibits heterogeneous perovskite nucleation, contributing to high quality film with diminished grain boundaries and lower defect density. The systematical density functional theory study has further indicated that freshly formed C-O σ bond resulted electrical property enhancement and the passivated Pb-I antisite defects are both originated from GDY introduction. The 21.11% power conversion efficiency with negligible hysteresis indicate such scenario may trigger unlimited reverie of promising GDY materials and provide more insights on elaborately interfacial design in perovskite solar cells.
关键词： graphdiyne,SnO2,solar cells,perovskite,interface engineering
更新于2025-09-23 15:21:01
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Graphdiyne: Bridging SnO <sub/>2</sub> and Perovskite in Planar Solar Cells
摘要： The collocation between charge transport layer and photoactive layer is extremely critical in solar energy conversion devices. More recently, it is especially prominent for promising planar perovskite solar cell based on SnO2 electron transfer layer (ETL) due to its unmatched photogenerated electron and hole extraction rates. Thereby, graphdiyne (GDY) with multi-roles has been incorporated to maximize the collocation between SnO2 and perovskite regarding perspectives of electron extraction rate optimization as well as the interface engineering for perovskite growth inducement and interfacial defect passivation, enabling such interfacial function towards both perovskite crystallization process and subsequent photovoltaic service duration. The GDY doped SnO2 layer finally results 4-times improved electron mobility and more facilitated band alignment. Simultaneously, the enhanced hydrophobicity effectively inhibits heterogeneous perovskite nucleation, contributing to high quality film with diminished grain boundaries and lower defect density. The systematical density functional theory study has further indicated that freshly formed C-O σ bond resulted electrical property enhancement and the passivated Pb-I antisite defects are both originated from GDY introduction. The 21.11% power conversion efficiency with negligible hysteresis indicate such scenario may trigger unlimited reverie of promising GDY materials and provide more insights on elaborately interfacial design in perovskite solar cells.
关键词： SnO2,Solar Cells,Graphdiyne,Perovskite,Interface Engineering
更新于2025-09-23 15:21:01
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Ultrafast Exciton Dissociation at the 2D-WS <sub/>2</sub> Monolayer/Perovskite Interface
摘要： In order for an excitonic photovoltaic (PV) device to perform efficiently, photogenerated excitons in the charge donor need to be dissociated through charge transfer (CT) to the acceptor rapidly after their photogeneration, and remain separated for a longer time to allow the collection of charges. To improve the efficiency of these steps, several combination of materials have been examined. Due to their excellent optical properties, two-dimensional transition metal dichalcogenides (2D-TMDs) have recently been explored. Another promising class of materials to platform efficient PVs is organic-inorganic perovskites. Here, we report on the ultrafast exciton dissociation through electron transfer from a 2D tungsten disulfide (WS2) monolayer to a thin layer of methylammonium lead iodide (CH3NH3PbI3) perovskites. Photoluminescence (PL) measurements showed that when the 2D-WS2 monolayer was covered with perovskites, its emission completely quenched, suggesting that the CT process is highly efficient. Despite that pump-probe spectroscopy measurements were carried out with a ~ 45 fs temporal resolution, the CT dynamics were not captured. A comparison of the ultrafast dynamics of the two band-edge excitons of the charge donor (2D-WS2) suggested that electron transfer is the dominant pathway of CT. Furthermore, these pump-probe measurements indicated that a small fraction of transferred electrons remained in the perovskites up to almost 2 ns. These findings may open a new horizon for understanding the dissociation of photogenerated excitons in 2D-TMD through hybridization with other class of nanomaterials.
关键词： Ultrafast Exciton Dissociation,Perovskite Interface,Hybrid Materials,Magnetic,Plasmonics,2D-WS2 Monolayer,Optical
更新于2025-09-23 15:21:01