Light intensity dependence of open-circuit voltage and short-circuit current of polymer/fullerene solar cells

Koster, L. Jan Anton; Mihailetchi, Valentin D.; Ramaker, Robert; Xie, Hangxing; Blom, Paul W. M.

doi:10.1117/12.665471

Cited by 75 publications

(97 citation statements)

References 17 publications

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“…The carrier recombination in an organic photocell without traps under open-circuit condition takes place in the bimolecular mechanism. It has been reported that the slope of the semilogarithmic plot of the V OC against the illumination light intensity of such photocell exactly matches the thermal voltage at room temperature [17]. Therefore, the deviation observed in the present device infers the loss of photocarriers due to the monomolecular recombination by traps in the composite under open-circuit condition.…”

Section: Resultsmentioning

confidence: 72%

Characteristics of PTB7:C70 bulk heterojunction photocell prepared with halogen-free solvent at low light illumination

Tada

2016

Polym. Bull.

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Increasing social demands for clean and cheap renewable energy sources have been promoting the researches on polymer photocells based on bulk heterojunction composites consisting of conjugated polymers and fullerenes. The replacement of traditional chloroaromatic solvents such as chlorobenzene with a halogen-free solvent 1,2,4-trimethylbenzene (TMB), which enables the preparation of bulk heterojunction composites with unmodified fullerenes, potentially reduces the economic and environmental costs of organic bulk heterojunction photocells. In this study, photovoltaic characteristics of PTB7:C 70 bulk heterojunction photocells prepared with TMB at low light intensity are studied. It has been found that the power conversion efficiency (PCE) of a photocell with ITO/PEDOT:PSS/PTB7:C 70 / Al structure whose PCE is approximately 3 % under AM1.5G 1 sun (100 mW/ cm -2 ) illumination increases with decreased illumination light intensity, being 5.9 % at 10 -3 sun illumination. An analysis of current-voltage characteristics suggests that the increased PCE is mainly due to increased shunt resistance and decreased saturation current of the diode in the model. The results indicate that the solution-processed organic photocell based on unmodified fullerene prepared with halogen-free solvent is a promising candidate for environmental-friendly device for indoor light harvesting.

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Section: Resultsmentioning

confidence: 72%

Characteristics of PTB7:C70 bulk heterojunction photocell prepared with halogen-free solvent at low light illumination

Tada

2016

Polym. Bull.

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“…This increase in exponent for former devices as compared to ITO/ PPHT:dye/Al device is due to the higher photogenerated excitons and consequently more dissociated carriers at higher intensity. A higher value of slope than unity could be due to the increased mobility at high density of carriers [42,43] and field-enhanced dissociation of excitons [44,45]. This also indicates that the incorporation of dye in the PPHT:ZnO blend reduces the recombination significantly.…”

Section: Article In Pressmentioning

confidence: 83%

Photovoltaic devices based on PPHT: ZnO and dye-sensitized PPHT: ZnO thin films

Suresh

Balaraju

Sharma

et al. 2008

Solar Energy Materials and Solar Cells

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“…Due to the efforts of several groups worldwide [5,13,14,[99][100][101][102][103], a record power conversion efficiency of 5% could be reached in 2005 [5]. The most important finding was that slow drying of the P3HT:PCBM layer leads to increased mobilities, thus preventing the build up of space charge inside the device [104][105][106][107][108][109][110]. Also, the degree of regioregularity, the polydispersities, and molecular weights of P3HT seems to have an important influence on the device efficiency [111].…”

Section: Blends Of Polymer and Small Moleculesmentioning

confidence: 87%

Recent Advances in Organic Solar Cells

Kietzke

2007

Advances in OptoElectronics

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Solar cells based on organic semiconductors have attracted much attention. The thickness of the active layer of organic solar cells is typically only 100 nm thin, which is about 1000 times thinner than for crystalline silicon solar cells and still 10 times thinner than for current inorganic thin film cells. The low material consumption per area and the easy processing of organic semiconductors offer a huge potential for low cost large area solar cells. However, to compete with inorganic solar cells the efficiency of organic solar cells has to be improved by a factor of 2-3. Several organic semiconducting materials have been investigated so far, but the optimum material still has to be designed. Similar as for organic light emitting devices (OLED) small molecules are competing with polymers to become the material of choice. After a general introduction into the device structures and operational principles of organic solar cells the three different basic types (all polymer based, all small molecules based and small molecules mixed with polymers) are described in detail in this review. For each kind the current state of research is described and the best of class reported efficiencies are listed.

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Light intensity dependence of open-circuit voltage and short-circuit current of polymer/fullerene solar cells

Cited by 75 publications

References 17 publications

Characteristics of PTB7:C70 bulk heterojunction photocell prepared with halogen-free solvent at low light illumination

Characteristics of PTB7:C70 bulk heterojunction photocell prepared with halogen-free solvent at low light illumination

Photovoltaic devices based on PPHT: ZnO and dye-sensitized PPHT: ZnO thin films

Recent Advances in Organic Solar Cells

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