A novel betavoltaic microbattery based on SWNTs thin film-silicon heterojunction

A betavoltaic microcell based on Au/s-SWCNTs/Ti Schottky junction

“…So Á can be calculated according to Eq. (5) reaching 5.20% which is about 35 times higher than the efficiency of SWCNTs film-Si structure microcell of our previous work [20]:…”

“…8 shows the dark I-V curve from −0.5 V to 0.5 V. Current density-voltage (J-V) curve and power density-voltage (P-V) curve are shown in Fig. 9, presenting the V OC of 26 mV and J SC of 2.19 A/cm 2 , which are both higher than those reported in our previous work [20]. Especially, the J SC is two orders of magnitude higher than the result of our previous work.…”

A betavoltaic microcell based on semiconducting single-walled carbon nanotube arrays/Si heterojunctions

“…where I 0 is the leakage current, q is electron charge, n is ideality factor of a diode, k is Boltzmann constant and T is temperature, we deduced that I 0 is 1.5pA and n is 1.83, displaying that the s-SWCNT/Si p-n junction has much better rectification performance than our foregoing two kinds of SWCNTs-based Schottky junctions [6,7]. Under the irradiation of 63 Ni, the I-V curve apparently moves downwards as shown in Figure 7.…”

“…Compared with traditional materials, single-walled carbon nanotube (SWCNT) is a perfect material due to the unique one-dimensional structure, defect-free property (which greatly lowers carrier recombination), high carrier mobility as well as low carrier scattering [4,5]. Our group has applied the SWCNTs material to the BV microcell as the energy conversion devices for the first time, such as the Schottky junction formed between metallic SWCNT (m-SWCNT) and semiconductor like SWCNT film/Si [6] and the asymmetric metal electrodes and semiconducting SWCNT (s-SWCNT) like Au/s-SWCNT/Ti [7]. The energy conversion efficiency (η) in [6] was 0.15% and that in [7] increased to 4.29%, but it's not a huge rise compared to the other conventional BV microcells.…”

“…Our group has applied the SWCNTs material to the BV microcell as the energy conversion devices for the first time, such as the Schottky junction formed between metallic SWCNT (m-SWCNT) and semiconductor like SWCNT film/Si [6] and the asymmetric metal electrodes and semiconducting SWCNT (s-SWCNT) like Au/s-SWCNT/Ti [7]. The energy conversion efficiency (η) in [6] was 0.15% and that in [7] increased to 4.29%, but it's not a huge rise compared to the other conventional BV microcells. The reason may be that the SWCNTs-based Schottky junctions do not have a good performance in the separation and collection of the beta-excited carriers.…”