17.46% efficient and highly stable carbon-based planar perovskite solar cells employing Ni-doped rutile TiO2 as electron transport layer

Band Alignment Engineering Towards High Efficiency Carbon‐Based Inorganic Planar CsPbIBr2 Perovskite Solar Cells

“…Figure 5e gives the Nyquistp lots of the cells with TiO 2 and TiO 2 / CsBr ETLs at af orwardb ias of 1V under dark condition. [8,36,43,44] The cell with TiO 2 /CsBr yields larger R rec than the cell with TiO 2 ,i ndicative of al ower recombination rate. [8,36,43,44] The cell with TiO 2 /CsBr yields larger R rec than the cell with TiO 2 ,i ndicative of al ower recombination rate.…”

“…[8,36,43,44] The cell with TiO 2 /CsBr yields larger R rec than the cell with TiO 2 ,i ndicative of al ower recombination rate. [8,22,29] Overall,t he above investigations reveal that the excellent photovoltaic property of the cells with TiO 2 /CsBr ETLs can be attributed to the suppressed recombination as well as improvede xtraction and transport of charge carriers. [8,22,29] Overall,t he above investigations reveal that the excellent photovoltaic property of the cells with TiO 2 /CsBr ETLs can be attributed to the suppressed recombination as well as improvede xtraction and transport of charge carriers.…”

“…Figure 5a presentst he corresponding dark J-V curves.I ti sc lear that the cell with TiO 2 /CsBr has a much lower leak current in contrast to the cell with unmodified TiO 2 ,s uggesting that the recombination of charge carriers is suppresseds ignificantly,w hich leads to improvedi ts V oc and FF,i na greement with the illuminated J-V measurement results. [8,16,24,44] The photocurrentdensity (J ph )-effective voltage (V eff )features were studied. The J ph is defined as J ph = J light ÀJ dark .H erein, J dark and J light are the current densitiesm easured under dark and AM 1.5 Gi llumination,r espectively.A nd, V eff is expressed as V eff = V 0 ÀV a ,w herein V 0 is the voltage when J ph is equal to 0mAcm À2 and V a is bias voltage.…”

“…Various inorganic halide perovskites, includingC sPbI 3 , [9,13] CsPbI 2 Br, [7] CsPbIBr 2 , [6,14,15] and CsPbBr 3 [4,5,8,11,16] ,w ere explored for carbon-based, all-inorganic PSCs. Amongt hem, CsPbBr 3 offers good phase stability,b ut has an intrinsically wideb and gap of % 2.3 eV that confines its absorption edge to % 540 nm, [4,8,11] limiting its use toward high-PCE cells. By contrast, CsPbI 3 and CsPbI 2 Br exhibit narrower band gaps ( % 1.73 and % 1.92 eV), but they easily transform into the undesired yellow phase (d phase) spontaneously under ambient conditions.…”

Solar‐Driven Rechargeable Lithium–Sulfur Battery

“…Accordingly, in the subsequent anodic scan, two oxidation peaks are observed at 2.37 and 2.41 V (vs Li/Li + ), corresponding to the oxidation of insoluble products (Li 2 S 2 /Li 2 S) to soluble polysulfides, and polysulfides to sulfur element. [46][47][48][49][50][51] To ensure a sufficient operating voltage for directly solar-driving Li-S battery, at least three PSC units should be connected in series. To improve the overall efficiency, [45] 2.41 V should also be the MPP of the solar cells unit.…”