The Effect of Ageing on Exciton Dynamics, Charge Separation, and Recombination in P3HT/PCBM Photovoltaic Blends

被引:46
作者
Deschler, Felix [1 ,2 ]
De Sio, Antonietta [3 ]
von Hauff, Elizabeth [4 ,5 ]
Kutka, Peter [6 ]
Sauermann, Tobias [6 ]
Egelhaaf, Hans-J. [6 ]
Hauch, Jens [6 ]
Da Como, Enrico [1 ,2 ]
机构
[1] Univ Munich, Dept Phys, Photon & Optoelect Grp, D-80799 Munich, Germany
[2] Univ Munich, CENS, D-80799 Munich, Germany
[3] Carl von Ossietzky Univ Oldenburg, Energy & Semicond Res Lab, Inst Phys, D-26111 Oldenburg, Germany
[4] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany
[5] Fraunhofer Inst Solar Energy Syst ISE, Freiburg, Germany
[6] Konarka Technol GmbH, D-90443 Nurnberg, Germany
关键词
photovoltaic cells; organic photovoltaics; polarons; fullerenes; conjugated polymers; POLYMER SOLAR-CELLS; CONJUGATED POLYMERS; DEGRADATION; EFFICIENCY; FILMS; POLYTHIOPHENE; TEMPERATURE; GENERATION; TRANSPORT; DEVICES;
D O I
10.1002/adfm.201101923
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A study of how light-induced degradation influences the fundamental photophysical processes in the active layer of poly(3-hexylthiophene)/[6,6]-phenyl C61-butyric acid methyl ester (P3HT/PCBM) solar cells is presented. Non-encapsulated samples are systematically aged by exposure to AM 1.5 illumination in the presence of dry air for different periods of time. The extent of degradation is quantified by the relative loss in the absorption maximum of the P3HT, which is varied in the range 0% to 20%. For degraded samples an increasing loss in the number of excitons within the P3HT domains is observed with longer ageing periods. This loss occurs rapidly, within the first 15 ps after photoexcitation. A more pronounced decrease in the population of polarons than excitons is observed, which also occurs on a timescale of a few picoseconds. These observations, complemented by a quantitative analysis of the polaron and exciton population dynamics, unravel two primary loss mechanisms for the performances of aged P3HT/PCBM solar cells. One is an initial ultrafast decrease in the polaron generation, apparently not related to the exciton diffusion to the polymer/fullerene interface; the second, less significant, is a loss in the exciton population within the photoexcited P3HT domains. The steady-state photoinduced absorption spectra of degraded samples exhibits the appearance of a signal ascribed to triplet excitons, which is absent for non-degraded samples. This latter observation is interpreted considering the formation of degraded sites where intersystem crossing and triplet exciton formation is more effective. The photovoltaic characteristics of same blends are also studied and discussed by comparing the decrease in the overall power conversion efficiency of solar cells.
引用
收藏
页码:1461 / 1469
页数:9
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