| Title: |
Defective TiO2 with high photoconductive gain for efficient and stable planar heterojunction perovskite solar cells |
| Authors: |
Li, Yanbo; Cooper, Jason K; Liu, Wenjun; Sutter-Fella, Carolin M; Amani, Matin; Beeman, Jeffrey W; Javey, Ali; Ager, Joel W; Liu, Yi; Toma, Francesca M; Sharp, Ian D |
| Source: |
Nature Communications, vol 7, iss 1 |
| Publisher Information: |
eScholarship, University of California |
| Publication Year: |
2017 |
| Collection: |
University of California: eScholarship |
| Subject Terms: |
Engineering; Chemical Sciences; Physical Chemistry |
| Description: |
Formation of planar heterojunction perovskite solar cells exhibiting both high efficiency and stability under continuous operation remains a challenge. Here, we show this can be achieved by using a defective TiO2 thin film as the electron transport layer. TiO2 layers with native defects are deposited by electron beam evaporation in an oxygen-deficient environment. Deep-level hole traps are introduced in the TiO2 layers and contribute to a high photoconductive gain and reduced photocatalytic activity. The high photoconductivity of the TiO2 electron transport layer leads to improved efficiency for the fabricated planar devices. A maximum power conversion efficiency of 19.0% and an average PCE of 17.5% are achieved. In addition, the reduced photocatalytic activity of the TiO2 layer leads to enhanced long-term stability for the planar devices. Under continuous operation near the maximum power point, an efficiency of over 15.4% is demonstrated for 100 h. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
unknown |
| Relation: |
qt9409m066; https://escholarship.org/uc/item/9409m066; https://escholarship.org/content/qt9409m066/qt9409m066.pdf |
| DOI: |
10.1038/ncomms12446 |
| Availability: |
https://escholarship.org/uc/item/9409m066; https://escholarship.org/content/qt9409m066/qt9409m066.pdf; https://doi.org/10.1038/ncomms12446 |
| Rights: |
public |
| Accession Number: |
edsbas.E792BC0C |
| Database: |
BASE |