TY - JOUR
T1 - Ultra-thick semi-crystalline photoactive donor polymer for efficient indoor organic photovoltaics
AU - Shin, Sang Chul
AU - Koh, Chang Woo
AU - Vincent, Premkumar
AU - Goo, Ji Soo
AU - Bae, Jin Hyuk
AU - Lee, Jae Joon
AU - Shin, Changhwan
AU - Kim, Hyeok
AU - Woo, Han Young
AU - Shim, Jae Won
N1 - Funding Information:
This research was supported by the Technology Development Program to Solve Climate Changes of the NRF funded by the Ministry of Science, ICT and Future Planning (NRF-2016M1A2A2940911, 2016M1A2A2940912). This research was also supported by Basic Science Research Program through the NRF funded by the Ministry of Education (NRF-2018R1D1A1B07043759) and through NRF funded by the Ministry of Science, ICT& Future Planning (2018R1A2B6008815). Furthermore, this work was supported by the NRF grant funded by the Korea government MOTIE (Ministry of Trade, Industry and Energy project number 10063473) (No. 2018R1D1A3B07049992).
Funding Information:
This research was supported by the Technology Development Program to Solve Climate Changes of the NRF funded by the Ministry of Science, ICT and Future Planning ( NRF-2016M1A2A2940911 , 2016M1A2A2940912 ). This research was also supported by Basic Science Research Program through the NRF funded by the Ministry of Education ( NRF-2018R1D1A1B07043759 ) and through NRF funded by the Ministry of Science, ICT& Future Planning ( 2018R1A2B6008815 ). Furthermore, this work was supported by the NRF grant funded by the Korea government MOTIE ( Ministry of Trade, Industry and Energy project number 10063473) (No. 2018R1D1A3B07049992 ).
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/4
Y1 - 2019/4
N2 - An in-depth study on the photovoltaic characteristics under indoor lights, i.e., light-emitting diode (LED), fluorescent lamps, and halogen lamps, was performed with varying the photoactive layer thickness (120–870 nm), by comparing those under 1-sun condition. The semi-crystalline mid-gap photoactive polymer, poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PPDT2FBT) and a fullerene derivative, [6,6]-phenyl C 71 butyric acid methyl ester (PC 70 BM) were used as a photoactive layer. In the contrary to the measurements under 1-sun condition, the indoor devices show a clearly different behavior, showing the thickness tolerant short-circuit current density (J SC ) and fill factor (FF) values with 280–870 nm thick photoactive layers. The retained J SC and FF values of thick indoor devices were discussed in terms of the parasitic resistance effects based on the single-diode equivalent circuit model. The much lower series/shunt resistance (Rs/R P ) ratio was measured with thick photoactive layer (≥280 nm), resulting in negligible decreases in the J SC and FF values even with a 870-nm-thick active layer under the LED condition. Under 1000 lx LED light, the PPDT2FBT:PC 70 BM device showed an optimum power conversion efficiency (PCE) of 16% (max power density, 44.8 μW/cm 2 ) with an open-circuit voltage of 587 mV, a J SC of 117 μA/cm 2 , and a FF of 65.2. The device with a 870-nm-thick active layer still exhibited an excellent performance with a PCE of 12.5%. These results clearly suggest that the critical parasitic resistance effects on the performance vary depending on the light illumination condition, and the large R P associated with the viable thick photoactive layer and the well-matched absorption (of photoactive layer) with the irradiance spectrum (of indoor light) are essential to realize efficient indoor photovoltaic cells with high J SC and FF.
AB - An in-depth study on the photovoltaic characteristics under indoor lights, i.e., light-emitting diode (LED), fluorescent lamps, and halogen lamps, was performed with varying the photoactive layer thickness (120–870 nm), by comparing those under 1-sun condition. The semi-crystalline mid-gap photoactive polymer, poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PPDT2FBT) and a fullerene derivative, [6,6]-phenyl C 71 butyric acid methyl ester (PC 70 BM) were used as a photoactive layer. In the contrary to the measurements under 1-sun condition, the indoor devices show a clearly different behavior, showing the thickness tolerant short-circuit current density (J SC ) and fill factor (FF) values with 280–870 nm thick photoactive layers. The retained J SC and FF values of thick indoor devices were discussed in terms of the parasitic resistance effects based on the single-diode equivalent circuit model. The much lower series/shunt resistance (Rs/R P ) ratio was measured with thick photoactive layer (≥280 nm), resulting in negligible decreases in the J SC and FF values even with a 870-nm-thick active layer under the LED condition. Under 1000 lx LED light, the PPDT2FBT:PC 70 BM device showed an optimum power conversion efficiency (PCE) of 16% (max power density, 44.8 μW/cm 2 ) with an open-circuit voltage of 587 mV, a J SC of 117 μA/cm 2 , and a FF of 65.2. The device with a 870-nm-thick active layer still exhibited an excellent performance with a PCE of 12.5%. These results clearly suggest that the critical parasitic resistance effects on the performance vary depending on the light illumination condition, and the large R P associated with the viable thick photoactive layer and the well-matched absorption (of photoactive layer) with the irradiance spectrum (of indoor light) are essential to realize efficient indoor photovoltaic cells with high J SC and FF.
KW - Indoor light conditions
KW - Organic photovoltaics
KW - Poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2, 5]thiadiazole)]
KW - Semi-crystalline polymer
KW - Single-diode equivalent circuit model
KW - Ultra-thick photoactive layer
UR - http://www.scopus.com/inward/record.url?scp=85060755955&partnerID=8YFLogxK
U2 - 10.1016/j.nanoen.2019.01.061
DO - 10.1016/j.nanoen.2019.01.061
M3 - Article
AN - SCOPUS:85060755955
SN - 2211-2855
VL - 58
SP - 466
EP - 475
JO - Nano Energy
JF - Nano Energy
ER -