Yoon, Youngwoon Kim, Hyeong Jun Cho, Chul-Hee Kim, Seulki Son, Hae Jung Ko, Min-Jae Kim, Honggon Lee, Doh-Kwon Kim, Jin Young Lee, Wonmok Kim, Bumjoon J. Kim, BongSoo 2024-01-20T10:33:49Z 2024-01-20T10:33:49Z 2021-09-05 2014-01-08 1944-8244 https://pubs.kist.re.kr/handle/201004/127227 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. English American Chemical Society ORGANIC PHOTOVOLTAIC DEVICES OPEN-CIRCUIT VOLTAGE SELF-ORGANIZATION PHASE-SEPARATION BUFFER LAYERS EFFICIENCY PHOTODISSOCIATION RECOMBINATION MORPHOLOGY DIFFUSION Carrier Lifetime Extension via the Incorporation of Robust Hole/Electron Blocking Layers in Bulk Heterojunction Polymer Solar Cells Article 10.1021/am404381e 1 ACS Applied Materials & Interfaces, v.6, no.1, pp.333 - 339 ACS Applied Materials & Interfaces 6 1 333 339 scie scopus 000329586300045 2-s2.0-84892406991 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article ORGANIC PHOTOVOLTAIC DEVICES OPEN-CIRCUIT VOLTAGE SELF-ORGANIZATION PHASE-SEPARATION BUFFER LAYERS EFFICIENCY PHOTODISSOCIATION RECOMBINATION MORPHOLOGY DIFFUSION organic photovoltaics polymer solar cells power conversion efficiency hole mobility carrier lifetime recombination rate