光谱学与光谱分析
光譜學與光譜分析
광보학여광보분석
SPECTROSCOPY AND SPECTRAL ANALYSIS
2015年
1期
19-23
,共5页
李畅%薛唯%章婷%赵谡玲
李暢%薛唯%章婷%趙謖玲
리창%설유%장정%조속령
聚合物太阳能电池%退火压强%相分离
聚閤物太暘能電池%退火壓彊%相分離
취합물태양능전지%퇴화압강%상분리
Polymer solar cells%Annealing pressure%Phase segregation
通过精确设定不同的退火环境气压，实现对P3HT（Poly（3-hexylthiophene-2，5-diyl）与PCBM（[6，6]-Phenyl C61 butyric acid methyl ester）体系中聚噻吩结晶度以及共混相分离程度的控制，并在此基础上制备了结构为ITO／PEDOT∶PSS／P3HT∶PCBM／Al的正型光伏器件。在允许的压强设定范围内，器件各项性能参数均随退火环境压强的增大表现出先升高后下降的变化规律，并统一于气压设定为1500 mTorr时获得最大值。从活性层的紫外-可见（UV-Vis）吸收光谱中发现P3HT在510 nm吸收峰以及550和600 nm肩峰附近的吸收强度随退火气压升高而增大，在气压为1500 mTorr时达到最高，吸收强度的提升源于聚合物分子π—π堆叠的增加。原子力显微镜（AFM ）进一步分析结果表明，高气压环境（＞1000 mTorr）能够促进P3HT∶PCBM共混组分在退火过程中形成较大程度的相分离，而当环境压强合适时（1500 mTorr）适度的相分离利于聚合物形成良好有序结晶，从而能够提升活性层内部载流子传输能力，保证较高的短路电流与填充因子，制备的器件也因此表现出良好的光伏性能，光电转化效率达到3.56％。
通過精確設定不同的退火環境氣壓，實現對P3HT（Poly（3-hexylthiophene-2，5-diyl）與PCBM（[6，6]-Phenyl C61 butyric acid methyl ester）體繫中聚噻吩結晶度以及共混相分離程度的控製，併在此基礎上製備瞭結構為ITO／PEDOT∶PSS／P3HT∶PCBM／Al的正型光伏器件。在允許的壓彊設定範圍內，器件各項性能參數均隨退火環境壓彊的增大錶現齣先升高後下降的變化規律，併統一于氣壓設定為1500 mTorr時穫得最大值。從活性層的紫外-可見（UV-Vis）吸收光譜中髮現P3HT在510 nm吸收峰以及550和600 nm肩峰附近的吸收彊度隨退火氣壓升高而增大，在氣壓為1500 mTorr時達到最高，吸收彊度的提升源于聚閤物分子π—π堆疊的增加。原子力顯微鏡（AFM ）進一步分析結果錶明，高氣壓環境（＞1000 mTorr）能夠促進P3HT∶PCBM共混組分在退火過程中形成較大程度的相分離，而噹環境壓彊閤適時（1500 mTorr）適度的相分離利于聚閤物形成良好有序結晶，從而能夠提升活性層內部載流子傳輸能力，保證較高的短路電流與填充因子，製備的器件也因此錶現齣良好的光伏性能，光電轉化效率達到3.56％。
통과정학설정불동적퇴화배경기압，실현대P3HT（Poly（3-hexylthiophene-2，5-diyl）여PCBM（[6，6]-Phenyl C61 butyric acid methyl ester）체계중취새분결정도이급공혼상분리정도적공제，병재차기출상제비료결구위ITO／PEDOT∶PSS／P3HT∶PCBM／Al적정형광복기건。재윤허적압강설정범위내，기건각항성능삼수균수퇴화배경압강적증대표현출선승고후하강적변화규률，병통일우기압설정위1500 mTorr시획득최대치。종활성층적자외-가견（UV-Vis）흡수광보중발현P3HT재510 nm흡수봉이급550화600 nm견봉부근적흡수강도수퇴화기압승고이증대，재기압위1500 mTorr시체도최고，흡수강도적제승원우취합물분자π—π퇴첩적증가。원자력현미경（AFM ）진일보분석결과표명，고기압배경（＞1000 mTorr）능구촉진P3HT∶PCBM공혼조분재퇴화과정중형성교대정도적상분리，이당배경압강합괄시（1500 mTorr）괄도적상분리리우취합물형성량호유서결정，종이능구제승활성층내부재류자전수능력，보증교고적단로전류여전충인자，제비적기건야인차표현출량호적광복성능，광전전화효솔체도3.56％。
The considerable performance enhancement of P3HT-based solar cell after thermal annealing can be attributed to the thermodynamically driven partial crystallization and phase segregation of each component .In the present work ,thermal annea-ling was executed by delivering P3HT ∶PCBM blend films onto the preheated susceptor in a PECVD chamber filled with high purity nitrogen gas .The pressure of inner chamber could be set steadily and precisely in the range of 1 to 1 850 mTorr at 150 ℃ . It was found that the phase segregation scale of two components was tuned to a certain extent by varying the annealing pressure , whereas the polymer crystallinity was slightly affected .According to the pressure settings ,polymer solar cells (PSCs) were fab-ricated in the following structure :ITO/PEDOT ∶ PSS/P3HT ∶ PCBM/Al .All of the device parameters exhibited the similar trend—an initial increase followed by a decrease ,and reached a peak at 1 500 mTorr with successive increase in annealing setting pressure .PSC annealed under 1 500 mTorr shows overall high performances with the power conversion efficiency up to 3.56% . The UV-Vis absorption spectra of annealed blend films shows that the vibronic absorption peaks (shoulders) at 510 ,550 and 600 nm became more pronounced under higher setting pressure ,which is attributed to better crystalline P3HT with increased π—πstacking of polymer molecules .The AFM results further suggest that high annealing pressure (>1 000 mTorr) promoted the domain formations of P3HT or PCBM ;moreover ,a moderate phase segregation ,as a result of an appropriate annealing pressure (1 500 mTorr) ,facilitates polymer crystallization which ensures the high charge (hole) mobility and consequently increased short-circuit current and fill factor .
