Abstract
We provided a new method to improve the efficiency of Sb2S3 thin film solar cells. The TiO2 electron transport layers were doped by lithium to improve their charge extraction properties for the thermal-evaporated Sb2S3 solar cells. The Mott-Schottky curves suggested a change of energy band and faster charge transport in the Li-doped TiO2 films. Compared with the undoped TiO2, Li-doped mesoporous TiO2 dramatically improved the photo-voltaic performance of the thermal-evaporated Sb2S3 thin film solar cells, with the average power conversion efficiency (PCE) increasing from 1.79% to 4.03%, as well as the improved open-voltage (Voc), short-circuit current (Jsc) and fill factors. The best device based on Li-doped TiO2 achieved a power conversion efficiency up to 4.42% as well as a Voc of 0.645 V, which are the highest values among the reported thermal-evaporated Sb2S3 solar cells. This study showed that Li-doping on TiO2 can effectively enhance the charge extraction properties of electron transport layers, offering a new strategy to improve the efficiency of Sb2S3-based solar cells.
Highlights
Investigation of low-cost, abundant, and efficient absorbing materials is one of the most important issues for solar cell applications
The Sb2 S3 films for solar cells application have been prepared by thermal evaporation and chemical deposition method [3,8,9,10,11,12]
The transport efficiency of photo-excited electrons from the absorbing layer to the electron transport layer was very low on the Sb2 S3 /TiO2 interface, which impeded the improvement of the power conversion efficiency [16]
Summary
Investigation of low-cost, abundant, and efficient absorbing materials is one of the most important issues for solar cell applications. The transport efficiency of photo-excited electrons from the absorbing layer to the electron transport layer was very low on the Sb2 S3 /TiO2 interface, which impeded the improvement of the power conversion efficiency [16] To overcome this limitation, some new materials and structures have been introduced into the Sb2 S3 solar cells, such as ZnO and ZnO cored TiO2 rods as electron transport layers to enhance the charge extraction process [17,18,19,20]. Doping of TiO2 layer has been reported as an effective method to improve the charge extraction in perovskite solar cells [21,22,23]. TiO2 as charge transport layers to fabricate the solar cells, and we find that Li-doping dramatically improves the photovoltaic performance of Sb2 S3 solar cells, with an average PCE of 4.03%, as well as a champion PCE up to 4.42% and Voc of 0.645 V, offering an efficient method to raise the photovoltaic performance of thermal-evaporated Sb2 S3 solar cells
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
