Photovoltage Approaching 0.9 V for Planar Heterojunction Silver Bismuth Iodide Solar Cells with Li-TFSI Additive

Abstract

Silver bismuth iodide (Ag−Bi−I) as an environmentally friendly semiconductor with suitable band gap and high stability has been regarded as a potential photovoltaic material, while the reported mesoscopic devices all showed poor open circuit voltage (V oc ) of 0.5−0.6 V. Here, we successfully fabricated AgBiI 4 planar heterojunction solar cells via a solution method with a V oc approaching 0.9 V, in which 2 wt % lithium bis(trifluoromethylsulfonyl)-imide (Li-TFSI) was added into the AgI:BiI 3 precursor. The device presents a power conversion efficiency of 2.50 ± 0.20% with a V oc of 0.82 ± 0.20 V. Experimental results indicated that the readily coordinated component in the organic salt, TFSI − , could assist film growth and result in a full coverage morphology. Furthermore, double layer devices showed the carrier separation occurred in the interface of SnO 2 /AgBiI 4 . These results indicated interface extraction and film enhancement should be concerned in further improvements.

Parallel Evaluation of the BiI3, BiOI, and Ag3BiI6 Layered Photoabsorbers

“…The negative J sc results could be attributed to non-optimal texture control, absence of a mesoporous ETL (for ABI), and a possible barrier at the BiI 3 /TiO 2 interface. As often reported in the literature 23,32,49,55 the present ABI cells exhibit scan rate-dependent hysteresis (Fig. 6(b)).…”

From Pb to Bi: A Promising Family of Pb‐Free Optoelectronic Materials and Devices

“…a,d,h,i,l) Reproduced with permission. [106,158] Copyright 2018, 2019, American Chemical Society. b,c,e-g) Reproduced with permission.…”

Perovskite-Inspired Lead-Free Ag2BiI5 for Self-Powered NIR-Blind Visible Light Photodetection

“…Among perovskite-inspired solution-processed semiconductors, rudorffites have attracted increasing attention over the last few years particularly because of their three-dimensional structure and because they do not contain heavily toxic elements [14][15][16][17][18][19][20][21][22][23][24]. Their structure relies on metal-halide [MX 6 ] octahedra (where M is a monovalent or trivalent metal, e.g., Bi, Sb, Cu, Ag, and X is a halide) as the building blocks of a three-dimensional lattice featuring an edgesharing packing motif [17][18][19].…”

“…Their structure relies on metal-halide [MX 6 ] octahedra (where M is a monovalent or trivalent metal, e.g., Bi, Sb, Cu, Ag, and X is a halide) as the building blocks of a three-dimensional lattice featuring an edgesharing packing motif [17][18][19]. In particular, silver-bismuth iodides (Ag a Bi b I x , x = a + 3b) have been identified as particularly promising, as evidenced by their increasing attention in photovoltaic research [14,15,[17][18][19][20][21][22][23][24]. In fact, their potential is confirmed by a rapid rise in solar power conversion efficiency (up to 4.3%) [14,15,[19][20][21][22][23].…”

“…In particular, silver-bismuth iodides (Ag a Bi b I x , x = a + 3b) have been identified as particularly promising, as evidenced by their increasing attention in photovoltaic research [14,15,[17][18][19][20][21][22][23][24]. In fact, their potential is confirmed by a rapid rise in solar power conversion efficiency (up to 4.3%) [14,15,[19][20][21][22][23]. Despite their promising optoelectronic properties, the capabilities of silver-bismuth iodides for photodetection have not been explored to date.…”