By using spin-coating technique, a low bandgap conjugated polymer, poly[2,6-(4,4-bis-(2-ethylhexyl)-4Hcyclopen-ta[2,1-b;3,4-b0]dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) and its composite thin films have been prepared. The optical absorption and photoconductive properties with over a wide spectral range, from 350 to 950 nm, were characterized. The obtained results showed that PCPDTBT:10 wt.% CdSe composite is the most suitable for efficient light-harvesting in polymer-based photovoltaic cells. | Volume 25, Number 2 June 2015 Contents Page Hoang Ngoc Long – Challenges in Particle Physics and 3-3-1 Models Truong Trong Thuc, Le Tho Hue, Dinh Phan Khoi, and Nguyen Thanh Phong – One Loop Corrections to Decay τ → µγ in Economical 3-3-1 Model Nguyen Quoc Khanh and Mai Thanh Huyen – Transport Properties of a Quasi-two-dimensional Electron Gas in InP/In1−x Gax As/InP Quantum Wells: Correlation and Magnetic Field Effects Vuong Son, Nguyen Duc Chien, Truong Thanh Toan, Doan Tuan Anh, Mai Anh Tuan, Luong Thi Thu Thuy, Pham Thi Kim Thanh – Development of Spray Pyrolysis System for Deposition of Nano-structure Materials Tran Thi Thao, Vu Thi Hai, Nguyen Nang Dinh, and Le Dinh Trong – Optical Property and Photoelectrical Performance of a Low-bandgap Conducting Polymer Incorporated with Quantum Dots Used for Organic Solar Cells Bui Trung Ninh, Nguyen Quoc Tuan, Ta Viet Hung, Nguyen The Anh, and Pham Van Hoi – Influence of ASE Noise on Performance of DWDM Networks Using Low-power Pumped Raman Amplifiers Ho Quang Quy, Nguyen Van Thinh, and Chu Van Lanh – Ultrasonic-controlled Micro-lens Arrays in Germanium for Optical Tweezers to Sieve the Micro-particles Nguyen Tuan Khai, Le Dinh Cuong, Do Xuan Anh, Duong Duc Thang, Trinh Van Giap, Nguyen Thi Thu Ha, Vuong Thu Bac, and Nguyen Hao Quang – Assessment of Radioactive Gaseous Effluent Released from Nuclear Power Plant Ninh Thuan 1 under Scenario of Ines-level 5 Nuclear Accident Nguyen Hoang Phuong Uyen, Gajovic-Eichelmann Nenad, Frank. F. Bier, and Ngo Vo Ke Thanh – Investigation of Immobilizing Antigens on Gold Surface by Potentiometric Measurements and Fluorescence Microscopic Vo Thi Lan Anh, Ngo Tuan Ngoc, Doan Minh Chung, K. G. Kostov, and B. I. Vichev – Development of the C-band Radiometer and Its Utilization for Sea Surface Temperature Research in Vietnam 97 113 ERRATUM: Simulation for Neutron Transport in PWR Reactor Moderator and Evaluation for Proper Thickness of Light Water Reflector – [Nguyen Tuan Khai and Phan .