Using the Stark effect to understand charge generation in organic solar cells

We have used a femtosecond-resolved spectroscopic technique based on the Stark effect (electromodulated differential absorption) in order to investigate free charge generation and charge drift in solar cell devices of neat conjugated polymer pBTTT and in its 1:1 (by weight) blend with PCBM. In the latter, the fullerene molecules intercalate between the polymer side-chains, yielding a co-crystal phase. Our results show that free charge generation in both materials is ultrafast and strongly dependent on the applied reverse bias. Charge drift to the electrodes (under strong reverse bias) occurs with comparable dynamics on the 1.2 ns time scale for neat pBTTT and the blend, and is probably dominated by hole transport within/between polymer chains.


Published in:
Physical Chemistry Of Interfaces And Nanomaterials XIV, 95490J 1-6
Presented at:
14th Conference on Physical Chemistry of Interfaces and Nanomaterials, San Diego, CA, Aug. 9-12, 2015
Year:
2015
Publisher:
Bellingham, Spie-Int Soc Optical Engineering
Keywords:
Laboratories:




 Record created 2015-08-26, last modified 2018-03-17

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