Carrier Lifetime Extension via the Incorporation of Robust Hole/Electron Blocking Layers in Bulk Heterojunction Polymer Solar Cells
- Carrier Lifetime Extension via the Incorporation of Robust Hole/Electron Blocking Layers in Bulk Heterojunction Polymer Solar Cells
- 윤영운; 김형준; 조철희; 김슬기; 손해정; 고민재; 김홍곤; 이도권; 김진영; 이원목; 김범준; 김봉수
- Organic photovoltaics; Polymer solar cells; Power conversion efficiency; Hole mobility; Carrier lifetime; Recombination rate
- Issue Date
- ACS Applied Materials & Interfaces
- VOL 6, NO 1, 333-339
- We report the achievement of a power conversion efficiency (PCE) improvement
in P3HT:PCBM-based bulk-heterojunction type polymer solar cells using photocrosslinked
P3HT (c-P3HT) as the electron blocking/hole extraction layer and titanium oxide nanoparticles
(TiO2) as the hole blocking/electron extraction layer. Devices prepared with a 20 nm thick c-
P3HT layer showed an improved PCE of 3.4% compared to devices prepared without the c-
P3HT layer (PCE = 3.0%). This improvement was attributed to an extension in the carrier
lifetime and an enhancement in the carrier mobility. The incorporation of the c-P3HT layer
lengthened (by more than a factor of 2) the carrier lifetime and increased (by a factor of 5) the hole mobility. These results suggest that the c-P3HT layer not only prevented non-geminate
recombination but it also improved carrier transport. The PCE was further improved to 4.0%
through the insertion of a TiO2 layer that acted as an effective hole-blocking layer at the interface between the photoactive layer and the cathode. This work demonstrates that the incorporation of solution-processable hole and electron blocking/extraction layers offers an effective means for preventing nongeminate recombination at the interfaces between a photoactive layer and an electrode in bulk-heterojunction-type polymer solar cells.
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