Solution‐Processed Antimony Selenide Heterojunction Solar Cells

Abstract

Figure 5. Photovoltaic device structure and performance. SEM images of A) top-view and B) cross-sectional Sb 2 Se 3 fi lm deposited on top of TiO 2 buffer. The thicknesses of v and Sb 2 Se 3 were about 100 nm and 580 nm, respectively. C) Schematic confi guration of TiO 2 /Sb 2 Se 3 heterojunction device. D) J -V curves of Sb 2 Se 3 solar cell performance in the dark and under 100 mW cm −2 simulated AM1.5G irradiation, respectively, and the performance of the device baked at 60 °C for 24 h. The inset shows an the image of our device.

Sb2Se3 Thin‐Film Photovoltaics Using Aqueous Solution Sprayed SnO2 as the Buffer Layer

“…To understand the reason of improved device performance, we investigated the photoresponse and photocurrent decay of Sb 2 Se 3 thin films deposited under different vacuum pressure. As shown in Figure 6c, the sample deposited under pressure of ≈0.5 Pa indicated a much lower dark current of 52 nA in contrast to 180 nA for another sample prepared under ≈5 Pa, which meant less intrinsic bulk defects presented in Sb 2 Additionally, our SnO 2 /Sb 2 Se 3 solar cells showed an excellent storage stability. As shown in Figure 7a, we stored the nonencapsulated device in ambient air at dark condition for more than 333 d, the device showed no degradation compared with initial state.…”

“…As shown in Figure 1b, when the temperature was lower than 143 °C, the weight loss corresponded to the dehydration from the sample. When the temperature increased to 181 °C, SnCl 2 reacted with H 2 O to form Sn(OH) 2 and HCl was released to the ambient. The Sn(OH) 2 decomposed into SnO and H 2 O gas when the temperature achieved 379 °C.…”

“…The conduction band offset was about 0.24 eV leading to a small spike at interface but would not hinder the flow of electrons. [17] Simultaneously, the large VBM offset blocked the injection of holes into SnO 2 Figure 5a. Device parameters were listed in Table 1.…”

“…Compared with CdTe and CIGS, Sb 2 Se 3 is non-toxic, low cost, and earth abundant. [2] Additionally, Sb 2 Se 3 possesses superior optoelectronic www.advelectronicmat. de In this article, we demonstrate the first application of SnO 2 as the buffer layer of Sb 2 Se 3 thin-film solar cells.…”

Thin-film Sb2Se3 photovoltaics with oriented one-dimensional ribbons and benign grain boundaries

“…Like CdTe, but in contrast with CIGS and CZTS, Sb2Se3 is a simple binary compound with fixed phase and stoichiometry. It has a very strong absorption coefficient (>10 5 cm -1 at short wavelengths) and its bandgap is ~1.1 eV 17,18 , optimal for single-junction solar cells. The constituents of Sb2Se3 are non-toxic and low in cost (Sb has similar cost to Cu), and, as we proceed to show herein, Sb2Se3 films are produced using minimal energy, enabling in principle a low energy-payback time for a solar cell 19 .…”