Highly efficient and bending durable perovskite solar cells: Toward a wearable power source

Byeong Jo Kim, Dong Hoe Kim, Yoo Yong Lee, Hee Won Shin, Gill Sang Han, Jung Sug Hong, Khalid Mahmood, Tae Kyu Ahn, Young Chang Joo, Kug Sun Hong, Nam Gyu Park, Sangwook Lee, Hyun Suk Jung

Research output: Contribution to journalArticlepeer-review

539 Citations (Scopus)


Perovskite solar cells are promising candidates for realizing an efficient, flexible, and lightweight energy supply system for wearable electronic devices. For flexible perovskite solar cells, achieving high power conversion efficiency (PCE) while using a low-temperature technology for the fabrication of a compact charge collection layer is a critical issue. Herein, we report on a flexible perovskite solar cell exhibiting 12.2% PCE as a result of the employment of an annealing-free, 20 nm thick, amorphous, compact TiOx layer deposited by atomic layer deposition. The excellent performance of the cell was attributed to fast electron transport, verified by time-resolved photoluminescence and impedance studies. The PCE remained the same down to 0.4 sun illumination, as well as to a 45°tilt to incident light. Mechanical bending of the devices worsened device performance by only 7% when a bending radius of 1 mm was used. The devices maintained 95% of the initial PCE after 1000 bending cycles for a bending radius of 10 mm. Degradation of the device performance by the bending was the result of crack formation from the transparent conducting oxide layer, demonstrating the potential of the low-temperature-processed TiOx layer to achieve more efficient and bendable perovskite solar cells, which becomes closer to a practical wearable power source.

Original languageEnglish
Pages (from-to)916-921
Number of pages6
JournalEnergy and Environmental Science
Issue number3
Publication statusPublished - 2015 Mar 1
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution


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